Please prove the following trigonometric identity. Do not send any links please.
Q. $\sin^{4} A - \cos^{2} A = \sin^{2} A - \cos A$

Question

Please prove the following trigonometric identity Do not send any
links please
Q sin 4 A - cos 2 A = sin 2 A - cos   A

Brijendra Pal · Accepted Answer

Hi, The correct question must be: cos4A - cos2A = sin4A - sin2A $L H S = \cos^{4} A - \cos^{2} A = \cos^{2} A [\cos^{2} A - 1] = - \cos^{2} A [1 - \cos^{2} A] = - \cos^{2} A \sin^{2} A = - \sin^{2} A [1 - \sin^{2} A]$ $= \sin^{4} A - \sin^{2} A = R H S$ â€‹

Please prove the following trigonometric identity. Do not send any links please. Q. sin 4 A - cos 2 A = sin 2 A - cos A

Please prove the following trigonometric identity. Do not send any links please.
Q. $\sin^{4} A - \cos^{2} A = \sin^{2} A - \cos A$