Question

trigonometric table
in the values of the following cos^2 77°-sin ^2 13°
(ans=0) pls show the Answer step by step process​

Answer 1

Answer:

0

Step-by-step explanation:

cos^2 77° - sin^2 13°

cos^2 ( 90- 13 )° - sin^2 13°

cos (90- theta) = sin theta

sin^2 13° - sin^2 13° = 0

hope it helps........

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