Cos²(π\4-¢\2)-sin²(π\4-¢\2
Answers
Answered by
1
Step-by-step explanation:
cos²(π/4 - ¢/2) - sin²(π/4 -¢/2)
= cos 2(π/4-¢/2) [cos2¢=cos²¢ - sin²¢]
= cos 2( π - 2¢/4)
= cos (π -2¢/2)
= cos (90°- ¢)
= cos (90°× 1 - ¢)
= sin¢. Ans.
Similar questions