Question

prove that sin theta-2sin^2 theta/2cos^3 theta-cos theta = tan theta

Answer 1

○=theta...
Sin○-2sin^3○/2cos^3○-cos○

=》sin○/cos○(1-2sin^2○/2cos^2○-1)

=》tan○[1-2 (1-cos^2○)/2cos^2○-1]

=》tan○(1-2+2cos^2○/2cos^2○-1)

=》tan○(2cos^2○-1/2cos^2○-1)

=》tan○

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