1.

By the principle of mathematical induction , prove that , for n in NN cos alpha + cos (alpha + beta)+cos (alpha + 2 beta) + .....+ cos (alpha +(n-1)beta) = cos (alpha + ((n-1)beta)/(2)) xx (sin((nbeta)/(2)))/(sin(beta/2))

Answer»


Answer :`COS (alpha+((n-1)BETA)/(2))xxsin((nbeta)/(2))/(SIN(beta/(2))`


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