Question

2) Find the value of (cos + sin )^2 + (cos - sin )^2
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Answer 1

Answer:

The answer is 2(cos^2 theta + sin^2 theta)

Step-by-step explanation:

cos^2 theta + sin^2 theta + 2 cos theta * sin theta + cos^2 theta + sin^2 theta -2 cos theta * sin theta

2 cos^2 theta + 2 sin^2 theta

2(cos^2 theta + sin^2 theta)