1.

Cos 15 degree​

Answer»

Answer:

(√3+1)/2√2

Step-by-step EXPLANATION:

cos15° = COS(45-30)°

as we know that , cos(a-b) = cos a*cos*b + SIN a*sin b

so ,

cos15° = 1/√2 * √3/2 + 1/√2 * 1/2

= √3 / 2√2 + 1 / 2√2

= (√3+1)/2√2


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