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amandasan98
amandasan98 amandasan98
  • 20-03-2017
  • Mathematics
Answered

Complete the trigonometric identity.

cot(-u)=

Verified Answer :

ghanami
ghanami ghanami
  • 22-03-2017

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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