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" 9."(cos x)/(1+cos x)...

" 9."(cos x)/(1+cos x)

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lim_(x rarr 0) (1-cos 7x)/(1- cos 9x) =

If int(cos 6x+cos 9x)/(1-2 cos 5x)dx=-(sin 4x)/(k)-sin x+C , then the value of k is .......... .

If int(cos 6x+cos 9x)/(1-2 cos 5x)dx=-(sin 4x)/(k)-sin x+C , then the value of k is .......... .

The general solution x for the equation 9^(cos x)-2.3^(cos x)+1=0 is

The general solution of x for the equation 9^(cos x)-2.3^(cos x)+1=0 is

int(1-cos x)/(cos x(1+cos x))dx

underset(x to 0)"Lt" (cos 7x-cos 9x)/(cos 3x-cos 7x)=

((sin 7x + sin 5x ) +(sin 9x + sin 3x))/( (cos 7x + cos 5x ) + (cos 9x + cos 3x ))= tan 6x