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Hi I want to solved I know that is right but how?

Hi galactus how shoud I solve this :confused:

sin^2 20=cos^2 20-cos^2 40

Thanks galactus you are right can you solve anther qusetion to

3sin3x=6sin3xcos3x
is it ture

3/4sin3A/2=3/2sin3A/4-cos3A/4
how you solved:confused:

Thanks

Hi how you solved?:confused:

sin(-2A)=-2sinAcos(-A)

sin(-2A)=-2sinAcos(-A)