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OpenStudy (anonymous):
prove: sin3&=2sin2&*cos&-sin&
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OpenStudy (gorv):
& this is angle????
OpenStudy (gorv):
sin3a=2sin2a*cosa-sina
OpenStudy (gorv):
@roeilz22
OpenStudy (anonymous):
yea
OpenStudy (gorv):
sin2a=2sina*cosa sin3a=2(2sina*cosa)*cosa-sina=4sina*cos^2a-sina but cos^2a=1-sin^2a 4sina*cos^2a-sina=4sina*(1-sin^2a)-sina =4sina-4sin^3a-sina =3sina-4sin^3a which is formula of sin3a 3sina-4sin^3a=sin3a
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OpenStudy (gorv):
@roeilz22
OpenStudy (anonymous):
thanks man!
OpenStudy (gorv):
wlcme alwyz buddy
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