value cos^2(180/6+x)-sin^2(180/6-x)
Attachments:
Answers
Answered by
3
Cos^2 (30+x)-sin^2 (30-x)
= cos(30+x+30-x)cos(30+x-30+x)
= cos(60)cos(2x)
= cos(2x)/2
= cos(30+x+30-x)cos(30+x-30+x)
= cos(60)cos(2x)
= cos(2x)/2
Similar questions