Question

cos 30 degree multiply cos 60 degree + sin 30 degree multiply sin 60 degree​

Answer 1

Answer:

$\cos(30) \times \cos(60) + \sin(30) \times \sin(60 ) \\ \frac{ \sqrt{3} }{2} \times \frac{1}{2} + \frac{1}{2} \times \frac{ \sqrt{3} }{2} \\ = \frac{ \sqrt{3} }{4} + \frac{ \sqrt{3} }{4} \\ = \frac{2 \sqrt{3} }{4} \\ = \frac{ \sqrt{3} }{2 }$

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