Quadratic~

if sinÎ± ,sinÎ²,sinÎ³ are in AP and cosÎ±,cosÎ²,cosÎ³ are in gp then find the value of

\frac{cos^{2}\alpha +cos^{2}\gamma -4cos(\alpha)cos(\gamma ) }{1-sin(\alpha )sin(\gamma) }

1 Answers

1357

Manish Shankar ·2009-12-19 23:02:44

This one is easy

We have
sinÎ²=(sinÎ±+sinÎ³)/2 (1)
cosÎ²=âˆš(cosÎ± cosÎ³) (2)

Square 1 and 2 and add you will get the answer

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