Question

Evaluate Sin 99°- Sin 81°​

Answer 1

Answer:

Sin(90+9)-sin(90-9)

=cos 9-cos 9=0

Answer 2

Sin 99° - Sin 81° = 0

Given :

The expression Sin 99° - Sin 81°

To find :

The value of the expression

Solution :

Step 1 of 2 :

Write down the given expression

The given expression is

Sin 99° - Sin 81°

Step 2 of 2 :

Find the value of the expression

Sin 99° - Sin 81°

= Sin ( 90° + 9° ) - Sin ( 90° - 9° )

= Cos 9° - Cos 9°

= 0

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