The value of cos²17° - sin²73° is
A. 1
B. 1/3
C. 0
D. -1
Answers
Answered by
3
The answer will be 0
I hope it will help you
Answered by
3
C. 0
Step-by-step explanation:
cos²17° - sin²73°
We know that sin (90° – x) = cos x and cos (90° – x) = sin x.
So cos²17° - sin²73° = cos²17° - (1 - cos²73°)
= cos²17° - 1 + cos²73°
= cos²17° + cos²73° - 1
= Sin²(90-17)° + cos²73° - 1
= Sin²73° + cos²73° - 1
= 1 - 1
= 0
Option C is the answer
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