Question

Find value of sqrt 3 cos 15 - sin 15
@dumbcow

Answer 1

0.89089

Answer 2

\[\cos \frac{x}{2} = \sqrt{\frac{1+\cos x}{2}}\]
\[\sin \frac{x}{2} = \sqrt{\frac{1-\cos x}{2}}\]

Answer 3

15 is half of 30

cos 30 = sqrt3/2

Answer 4

Is that a formula

Answer 5

yes plug in sqrt3/2 for cos x where x is 30 for this problem, this way you can find value for cos 15 and sin 15

Answer 6

will try nw..

Answer 7

like this ?
@dumbcow