Differentiate each of the following w.r.t. x:
cos 4
Formulae :
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• 
• 
• 
Let,
y = cos 4x. cos 2x
…………. 
Differentiating above equation w.r.t. x,
…………. 
…………. 
= -3 sin 6x – sin 2x
= - (3 sin 6x + sin 2x)
1
Differentiate each of the following w.r.t. x:
cos 4
Formulae :
•
•
•
•
Let,
y = cos 4x. cos 2x
………….
Differentiating above equation w.r.t. x,
………….
………….
= -3 sin 6x – sin 2x
= - (3 sin 6x + sin 2x)