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Mathematics
Brycen Bates
9 February, 01:20
Cos³x. tan²x - cosx = ?
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Luz Prince
9 February, 04:34
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tan x = sin x/cos x
cos³ x * tan²x - cos x = cos³x * (sin²x / cos² x) - cos = cosx*sin²x - cos x =
= cos x (sin² x - 1) = - cos x (1 - sin²x) = - cosx*cos²x = - cos³ x
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