Determine all the possible value of x where 0 deg <= x <= 360 deg.

How to solve this question?

cos x cos 20^{0 }+ sin x sin 20^{0} = square root 3/2.

Re: Determine all the possible value of x where 0 deg <= x <= 360 deg.

Hint: Consider using the angle sum/difference identity for cosine...

Re: Determine all the possible value of x where 0 deg <= x <= 360 deg.

COS(x-20)=square root 3/2

then easy...

Re: Determine all the possible value of x where 0 deg <= x <= 360 deg.

Quote:

Originally Posted by

**MINOANMAN** COS(x-20)=square root 3/2

then easy...

You have robbed the OP of the chance to find that on their own...it is good forum etiquette NOT to come along behind someone who has offered a suggestion and essentially solve the problem.