Cos^4 A - sin^4 A is equal to Options:
a) 2 cos^2A +1 b) 2cos^2A -1 c)2sin^2A-1
d)2sin^2A+1
Answers
Answered by
0
Answer: b) cos2A = 2cos^2A-1
Step-by-step explanation:
Attachments:
Similar questions