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sophiewrightt11 sophiewrightt11
  • 16-08-2016
  • Mathematics
Answered

Rewrite with only sin x and cos x.


cos 3x

Verified Answer :

Panoyin
Panoyin Panoyin
  • 16-08-2016

cos(3x)

cos(2x + x)

cos(2x)cos(x) - sin(2x)sin(x)

[cos²(x) - sin²(x)][cos(x)] - [2sin(x)cos(x)][sin(x)]

cos³(x) - sin²(x)cos(x) - 2sin²(x)cos(x)

cos³(x) - 3sin²(x)cos(x)

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