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sin(9x)-cos(9x) *Write The expression in terms of SINE only

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sin(9x)-cos(9x) *Write The expression in terms of SINE only

Apr 28th, 2015

We know that

cosx = sin(90-x)

thus 

cos9x=sin(90-9x)

we need to replace

sin(9x)-cos(9x)

to get

sin(9x)-sin(90-9x)


Apr 28th, 2015

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Apr 28th, 2015
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Apr 28th, 2015
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