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Poster has been reminded to post schoolwork in the Homework Help forums

I'm revising differentiation for tomorrow, I am hopelessly stuck on some things.

I have some examples with answers, but I have no idea which rules are being used.

y=2sin3x dy/dx=6cos3x

I see that sin goes to cos but why is the two multiplied by the 3 (if that's what's happening)???

y=3sin1/2x+e^x dy/dx= 6cos1/2x+e^x

Thank you

I have some examples with answers, but I have no idea which rules are being used.

y=2sin3x dy/dx=6cos3x

I see that sin goes to cos but why is the two multiplied by the 3 (if that's what's happening)???

y=3sin1/2x+e^x dy/dx= 6cos1/2x+e^x

Thank you