Question

solve the eqn:
cos(x+60)=2sinx)

Answer 1

you could use
cos(a+b)= cos(a)cos(b)- sin(a)sin(b)
as a first step.

Answer 2

use the double angle theroem

Answer 3

cos60=1/2 and sin60=\[\cos(a+b)= \cos(a)\cos(b)- \sin(a)\sin(b) \]
\[\cos(x)\cos(60)- \sin(x)\sin(60)=2\sin(x)\]
\[\cos(60)= \frac{ 1 }{ 2} and \sin(60)=\frac{ \sqrt{3} }{2}\]
\[\therefore\]\[\frac{ \cos(x) }{ 2 }-\frac{ \sqrt3(\sin(x)) }{ 2 }=2\sin(x)\]

Answer 4

Obumpa, have you read the code of conduct? It would be better to let the asker make some progress on their own

Answer 5

Oh sorry. You're right