prove: sinteta-2sin^3teta/2cos^3teta-costeta=tanteta
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[sin@(1-2sin²@)]/[cos@(2cos²@-1)],
[[email protected]@]/[[email protected]@],
(since 1-sin²@=cos2@ & 2cos²@-1=cos2@),
sin@/cos@,
tan@
[[email protected]@]/[[email protected]@],
(since 1-sin²@=cos2@ & 2cos²@-1=cos2@),
sin@/cos@,
tan@
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