y=cos³2x
Find d²y/dx²
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y=(cos2x)^3
diff w r t x
dy/dx=3(cos2x)^2. d/dx(cos2x)
by x^n formla
=3(cos2x)^2.(-sin2x).2
=-3cos2x.cos2x.2sin2x
=-3cos2x.sin4x
by sin2x formula ie2sinx .cosx
again diff w rt x using u.v rule(hint)
diff w r t x
dy/dx=3(cos2x)^2. d/dx(cos2x)
by x^n formla
=3(cos2x)^2.(-sin2x).2
=-3cos2x.cos2x.2sin2x
=-3cos2x.sin4x
by sin2x formula ie2sinx .cosx
again diff w rt x using u.v rule(hint)
welcometohellv:
but this isn't the answer
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