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3 years ago

5

Convert this identity to one using sine term(s) only. 1-2cos(r)^2

1 answer:

Natali5045456 [20]3 years ago

8 0

Pythagorean identity:
sin²+cos²=1
Then cos²=1-sin²
Substitute:
1-2cos²
1-2(1-sin²)
1-2+2sin²
2sin²-1

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