Question

Find the value of cos 15 degree

Answer 1

Answer:

, , , , , ,

Step-by-step explanation:

,,,,, , , , , , , , , ,

Answer 2

Step-by-step explanation:

cos 15= cos(45-30)

Applying cos(A-B) formula

cos15= cos45cos30+sin45sin30

=1/√2*√3/2+1/√2*1/2

= √3/2√2+1/2√2

= √3+1/2√2