Could anyone give me some hints? I can't think the first step~ Given that , , express the following in therms of a and b: (a) cos (x - y) (b) sin (x - y)
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Originally Posted by ling_c_0202 Could anyone give me some hints? I can't think the first step~ Given that , , express the following in therms of a and b: (a) cos (x - y) (b) sin (x - y) (a) Thus, Thus, Thus, Thus, Thus,
Try multiplying each relation by and adding and subtracting.
Thank you very much!! ^^
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