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of differentiation of trigonometric functions

1. y=cos(3x^2+8x-2)

2. y=tan^3 2x

3. y=sin5x sin^5 x

4. y=Square root of 4sin^2x+9cos^2x

help here please..

i cant understand trigonometric functions

sorry admin or moderator, i just search the net on how to do this problems.. and this are my answer

for

1. -6x+8sin(3x^2+8x-2)

2. 6 tan 2x sec^2 2x

3. 5 cos 5x 5 sin x cos x or 5 cos 5x 5 sin^4 x cos x

4. 8 sec^4 2x tan 2x

Are my answers correct.. Help me please