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galben [10]
3 years ago
15

Rewrite with only sin x and cos x.

Mathematics
1 answer:
fiasKO [112]3 years ago
8 0

Answer:

sin(3x) = sin(x + 2x)

          = sinx cos(2x) + cosx sin(2x)

          = sinx [1 - 2sin2x] + cosx [2sinxcosx]

          = sinx - 2sin3x + 2cos2xsinx

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