sin(5x)cos(8x)-cos(5x)sin(8x)=-0.65
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Step-by-step explanation:
sin(5x)cos(8x)-cos(5x)sin(8x)=-0.65
it is in the form of sin A cos B- cos A sin B =sin(A-B)
according to the formula:
sin(5x)cos(8x)-cos(5x)sin(8x)= sin(5x-8x)
= sin (-3x)
= - sin3x
-sin3x=-0.65
sin3x=0.65
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