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Question

Find the exact value of the expression cos^(2)15deg -cos^(2)30deg +cos^(2)45deg -cos^(2)60deg +cos^(2)75deg

Top Answer

the value of the given expression can be find by using some trigonometric logic and the know values of... View the full answer

exp1.jpg

A = 1 - Cos ( 30) + Cos ( 45) - 65 (60)
N
CoS (30 ) = J
1
- 15
15
This will be the Exact value of the Expression.
cos ( 45 ) =
COS ( 60 ) =
- Id
+
Ans .
5 / w
A = 1 -
-
11
I
A =
VVU

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