SOLUTION: sin2a/1-cos^2a x sin2a/cos2a= 4cosa

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Question 1010873: sin2a/1-cos^2a x sin2a/cos2a= 4cosa
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
sin2a/1-cos^2a x sin2a/cosa=4cosa
2sina*cosa/sin^2a * 2sina*cosa/cos a =
4*sin^2a*cos^2a / sin^2a* cosa =
4 cos^2 a / cos a =
4 cos a = 4 cos a