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Cos2x + sin2 x =______

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Cos2x + sin2 x =______

asked Feb 11, 2017 20.9k views

4 votes

Cos2x + sin2 x =______

Mathematics
high-school

Melanie Shebel asked

by Melanie Shebel

7.8k points

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1 Answer

4 votes

cos²(x) + sin²(x)
¹/₂[1 - cos(2x)] + ¹/₂[1 + cos(2x)]
[¹/₂ - ¹/₂cos(2x)] + [¹/₂ + ¹/₂cos(2x)]
¹/₂ + ¹/₂ - ¹/₂cos(2x) + ¹/₂cos(2x)
1

Gladwin Burboz answered Feb 15, 2017

by Gladwin Burboz

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