Andy C. answered • 08/03/18
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(1-cos^2)/ tan^2 =
sin^2 / tan^2 =
sin^2 divided by sin^2/cos^2 =
sin^2 * cos^2/sin^2 <---- KFC: keep change flip
cos^2
Grape C.
asked • 08/03/18Proof of trigonometric identity
(1-cos^2x)/tan^2x=cos^2x
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