8.3.40
for this one, i'm not sure if i did it the right way.
sin4x = 4sinx*2cosx = 3.84
is this the way you're supposed to do it?
sin4x = 4sinx*2cosx = 3.84
is this the way you're supposed to do it?
posted by Monica Moore at 7:24 PM
1 Comments:
sin x=.6
cos x=.8
sin(4x)=sin(2x+2x)
=sin(2x)cos(2x)+cos(2x)sin(2x)
=2(2cos(x)sin(x)(cos^2(x)-sin^2(x))
=336/625
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