Question

Cos60° *Cos30° +Sin60° *Sin30° is equal to

Answer 1

This type of trigonometrical sum can be solved by 2 ways:-

Lets start with WAY 1:-

●Directly substituting values:-

$\frac{1}{2} \times \frac{ \sqrt{3} }{2} + \frac{ \sqrt{3} }{2} \times \frac{1}{2} = \frac{ \sqrt{3} }{2}$

●The other way is using the formula:

✍cos(A - B) = cos A cos B + sin A sin B

Here, A = 60° and B = 30°

so, applying this formula:-

●cos ( 60° - 30°) = cos 30°

where,

$\cos(30) = \frac{ \sqrt{3} }{2}$

Answer 2

Answer:

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Step-by-step explanation:

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