amandasan98 amandasan98

20-03-2017
Mathematics

contestada

Complete the trigonometric identity.
cot(-u)=

Respuesta :

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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