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15 November, 17:29

Complete the trigonometric identity.

cot (-u) =

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  1. 15 November, 20:01
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    Hello:

    cot (-u) = cos (-u) / sin (-u)

    = cos (u) / (-si (u)) because : cos (-u) = cos (u) and sin (-u) = - sin (u)

    = - (cos (u) / si (u))

    cot (-u) = - cot (u)
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