For this we need the identity,
sin(a+b)= sin a cos b+cos a sin b. Here a=4x and b=3x. So,
sin 4x cos 3x+cos 4x sin 3x=sin(4x+3x)=sin 7x.
Palera V.
asked • 03/18/20Calculus Question
Simplify: sin 4x cos 3x + cos 4x sin 3x
a. cos x
b. cos 7x
c. sin 7x
d. sin x
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