1.

Find: Sin 30° x cos 15° + cos 30° x sin 15°

Answer»

Sin 30° x cos 15° + cos 30° x sin 15°

= Sin (30° + 15°) (∵ Sin A. cos B + cos A. sin B = sin (A+B))

= Sin 45°

\(\frac {1}{\sqrt2}\) 



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