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first
sin5x sin 3x =-1/2{cos(5x+3x) - cos (5x-3x)}

how in the gods name did you get that

|dw:1359154820627:dw|

the only trick we know so far are the trigonometric identities and half angle formula

so confused ...

understand ?
i use product to sum formula

oh okay thanks

ive never seen that format of sum for sine before thanks. is there other ways to do it or is that it

i guess ill have to remember the sum rule then :P

the other one you sent is not gonna be much help in the long run probably. thanks a lot though