Question

Find the value of x if cos2x - sin 60° cos 30º - cos 60° sin 30º.​

Answer 1

Answer:

Q)Find the value of x if cos2x=sin60°cos30°-cos60°sin30°

Step-by-step explanation:

we know that ,sin60=√3/2,cos30=√3/2,cos60=2/2,sin30=1/2. sin60cos30-cos60 sin30=√3/2*√3/2-1/2*1/2. =3/4-1/4=2/4=1/4. Cos2x=1/4,2x=2/4,x=1/2,Cox's=1/2,x=60°....….............please follow me