Question

evaluate (sin theta+cos theta)²+(cos theta-sin theta)²
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Answer 1

Answer:

(sin ø+cos ø)²+(cos ø-sinø)²

sin²ø+cos²ø+2 sinøcosø+cos²ø+sin²ø-2 sinøcosø

1+1=2(sin²ø+cos²ø=1)

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