Question

(cos theta + sin theta)² + (cos theta - sin theta)² =​

Answer 1

Answer:

Expanding the given expression we get

(cosA+sinA)2−(cosA+sinA)2

=cosA2+sinA2+2cosAsinA−(cosA2+sinA2−2cosAsinA)

=2(2cosAsinA)

=4cosAsinA

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Answer 2

Answer:

2

cos^2 theta + sin^2 theta = 1

this is an identity

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