iroostin iroostin

08-03-2018
Mathematics

contestada

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

Respuesta :

demariaa01 demariaa01

08-03-2018

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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