Hi I know the formula but what about
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Originally Posted by zizou1089 Hi I know the formula , but what about , assuming , and the other two below are, of course, exactly the same as the first two (why do you think they're different??) Tonio .
Just making sure about the other 2! Thanks!
Originally Posted by tonio . would it not be.. ??
Originally Posted by zizou1089 would it not be.. ?? cos(a+ b)= cos(a)cos(b)- sin(a)sin(b). In particular, if and , . Of course, , for all n, and . Therefore, . For , use the fact that cosine is an even function: there is no difference at all between and . They both mean exactly the same thing.
Originally Posted by zizou1089 would it not be.. ?? If n=1, this is If n=2, it's so the power of is n
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