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OpenStudy (anonymous):
simplify by using a double angle or a half angle formula sin 4° ___________ 1 + cos 4°
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OpenStudy (raden):
use the half angle formulae : tan(x/2) = sin(x)/(1+cos(x))
OpenStudy (raden):
put x=4 into that formula, it is tan 2°
OpenStudy (anonymous):
thx
OpenStudy (raden):
welcome ;)
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