Question

cos(45°-60).Please help me for solving this.​

Answer 1

Answer:

$\cos(45 - 60) = \cos(45) \cos(60) + \sin(45) \sin(60)$

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

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

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

is the answer of this question