# FIND THE VALUES OF THE OTHER FIVE TRIGONOMETRIC FUNCTIONS OF THETA

In six trigonometric ratios sin, cos, tan, csc, sec and cot, if the value of one of the ratios is given, we can find the values of the other five functions.

The following steps will be useful in the above process.

Step 1 :

The given given trigonometric ratio has to compared with one of the formulas given below.

sin θ = Opposite side/hypotenuse side

cos θ = Adjacent side/hypotenuse side

tan θ = Opposite side/Adjacent side

cosec θ = Hypotenuse side/Opposite side

sec θ = Hypotenuse side/Adjacent side

cot θ = Adjacent side/Opposite side

Step 2 :

Now, find the missing side from the given known sides.

Step 3 :

By using the above formula, find the values of the other trigonometric ratios.

## Examples

Example 1 :

If sin A  =  9/15, find the other trigonometric ratios

Solution :

sin θ  =  Opposite side/hypotenuse side

sin A  =  9/15

Opposite side  =  9, Hypotenuse side  =  15

(Hypotenuse side)2  =  (Opposite side)2 + (Adjacent side)2

Adjacent side  =  √152 - 92

=  √225 - 81

=  √144

cos A  =  Adjacent side/hypotenuse side  =  12/15

tan A  =  Opposite side/Adjacent side  =  9/12

cosec A  =  Hypotenuse side/Opposite side  =  15/9

sec A  =  Hypotenuse side/Adjacent side  =  15/12

cot A  =  Adjacent side/Opposite side  =  12/9

Example 2 :

If cos A  =  15/17, find the other trigonometric ratios

Solution :

cos θ  =  Adjacent side/hypotenuse side

cos A  =  15/17

Adjacent side  =  15, Hypotenuse side  =  17

(Hypotenuse side)2  =  (Opposite side)2 + (Adjacent side)2

Opposite side  =  √172 - 152

=  √289 - 225

=  √64

Opposite side  =  8

sin A  =  Opposite side/hypotenuse side  =  8/17

tan A  =  Opposite side/Adjacent side  =  8/15

cosec A  =  Hypotenuse side/Opposite side  =  17/8

sec A  =  Hypotenuse side/Adjacent side  =  17/15

cot A  =  Adjacent side/Opposite side  =  15/8

Example 3 :

If sec θ  =  17/8, find the other trigonometric ratios

Solution :

sec θ  =  Hypotenuse side/Adjacent side

sec θ  =  17/8

Hypotenuse side  =  17, Adjacent side  =  8

(Hypotenuse side)2  =  (Opposite side)2 + (Adjacent side)2

Opposite side  =  √172 - 82

=  √289 - 64

=  √225

Opposite side  =  15

sin θ  =  Opposite side/hypotenuse side  =  15/17

cos θ  =  Adjacent side/hypotenuse side  =  8/17

tan θ  =  Opposite side/Adjacent side  =  15/8

cosec θ  =  Hypotenuse side/Opposite side  =  17/15

cot θ  =  Adjacent side/Opposite side  =  8/15 Apart from the stuff given above, if you need any other stuff in math, please use our google custom search here.

You can also visit the following web pages on different stuff in math.

WORD PROBLEMS

Word problems on simple equations

Word problems on linear equations

Algebra word problems

Word problems on trains

Area and perimeter word problems

Word problems on direct variation and inverse variation

Word problems on unit price

Word problems on unit rate

Word problems on comparing rates

Converting customary units word problems

Converting metric units word problems

Word problems on simple interest

Word problems on compound interest

Word problems on types of angles

Complementary and supplementary angles word problems

Double facts word problems

Trigonometry word problems

Percentage word problems

Profit and loss word problems

Markup and markdown word problems

Decimal word problems

Word problems on fractions

Word problems on mixed fractrions

One step equation word problems

Linear inequalities word problems

Ratio and proportion word problems

Time and work word problems

Word problems on sets and venn diagrams

Word problems on ages

Pythagorean theorem word problems

Percent of a number word problems

Word problems on constant speed

Word problems on average speed

Word problems on sum of the angles of a triangle is 180 degree

OTHER TOPICS

Profit and loss shortcuts

Percentage shortcuts

Times table shortcuts

Time, speed and distance shortcuts

Ratio and proportion shortcuts

Domain and range of rational functions

Domain and range of rational functions with holes

Graphing rational functions

Graphing rational functions with holes

Converting repeating decimals in to fractions

Decimal representation of rational numbers

Finding square root using long division

L.C.M method to solve time and work problems

Translating the word problems in to algebraic expressions

Remainder when 2 power 256 is divided by 17

Remainder when 17 power 23 is divided by 16

Sum of all three digit numbers divisible by 6

Sum of all three digit numbers divisible by 7

Sum of all three digit numbers divisible by 8

Sum of all three digit numbers formed using 1, 3, 4

Sum of all three four digit numbers formed with non zero digits

Sum of all three four digit numbers formed using 0, 1, 2, 3

Sum of all three four digit numbers formed using 1, 2, 5, 6 