sin 0 - 2 sine^3/2 cos^3 0 - cos 0
=
tane
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➡sinØ-2sin³Ø/2cos³Ø-cosØ
➡sinØ(1-2sin²Ø)/cosØ(2cos²Ø-1)
➡sinØcos2Ø/cosØcos2Ø
➡sinØ/cosØ
➡tanØ
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