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  1. J

    trigonometry problems

    I can't do these problems on trigonometry, can someone help me on these please ? Show that for all x which is an element of R, cos x = 1- (1/2!)x^2 + (1/4!)x^2...and sin x = x - (1/3!)x^3 + (1/5!)x^5... (a) To do this, let C(x) and S(x) denote the sums of the two series. Verify that...
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