2*cos3x

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To prove (cos5x+cos4x)/(1-2cos3x) = -cos2x-cosx

Solve for x : 2cos3x-1=0

Solve for x : 2cos(3x-15^(@))=1

Differentiate the functions given w.r.t.x: cos x*cos2x*cos3x

To prove (cos5x+cos4x)/(1-2cos3x)=-cos2x-cos x

If 3cosx + 2cos3x=cosy , 3sinx + 2sin3x =siny , then cos2x equals

cosx + cos2x + cos3x=0

int cos x cos 2x cos 3x dx=

Differentiate Cos x * Cos 2x * cos 3x