Question

cos2 35+ cos2 55 का मान ज्ञात कीजिए।​

Answer 1

Answer:

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Step-by-step explanation:

y = 2 − cos 2 ( 35 ∘ ) − cos 2 ( 55 ∘ )

= 1

Explanation:

We want to evalutae

y = 2 − cos 2 ( 35 ∘ ) − cos2 ( 55 ∘ )  

We will use the trigonometric identities

cos 2( x ) = 1 2 ( 1 + cos)( 2 x ) ) cos ( x )

= − cos ( 180 − x )

Thus

The answer lies in the attachment

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