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sin(70°) =

 

A) sin(50°)cos(20°) − cos(50°)sin(20°)

B) sin(50°)cos(20°) + cos(50°)sin(20°)

C) cos(50°)cos(20°) − sin(50°)sin(20°)

D) cos(50°)cos(20°) + sin(50°)sin(20°)

E) cos(20°)sin(20°) − sin(50°)cos(50°)

 Oct 2, 2019
 #1
avatar+21784 
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sin(α + β) = sin(α) cos(β) + cos(α) sin(β)

 Oct 2, 2019
 #2
avatar+1651 
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it's B correct ?

macabresubwoofer  Oct 2, 2019

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