hailluka hailluka

03-04-2017
Mathematics

contestada

simplify cos(-1/3+-1/4)

Respuesta :

03-04-2017

cod (-0.3-0.25)=
cos (-0.55)=0.45.

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ghanami ghanami

03-04-2017

hello :
cos(-π/3 -π/4) = cos(- (π/3 +π/4) ) = cos (π/3 +π/4)
= cos(π/3) cos(π/4) - sin(π/3) sin(π/4)
= (1/2)(√(2)/2) - (√(3)/2)(√(2)/2)
=(√(2)-√(6)/)/4

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