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" 28."(cos^(9)x)/(sin x)...

" 28."(cos^(9)x)/(sin x)

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" 9."int(sin x)/(sin x+cos x)dx

Number of solutions (s) of the equation (sin x)/(cos 3x) +(sin 3x)/(cos 9x)+(sin 9x)/(cos 27 x)=0 in the interval (0, pi/4) is __________.

Number of solutions (s) of the equation (sin x)/(cos 3x) +(sin 3x)/(cos 9x)+(sin 9x)/(cos 27 x)=0 in the interval (0, pi/4) is __________.

Number of solutions (s) of the equation (sin x)/(cos 3x) +(sin 3x)/(cos 9x)+(sin 9x)/(cos 27 x)=0 in the interval (0, pi/4) is __________.

int_(0)^( pi/2)(sin^(9/2)x)/(sin^(9/2)x+cos^(9/2)x)dx

int_(0)^( pi/2)(sin^(9/2)x)/(sin^(9/2)x+cos^(9/2)x)dx

Prove that cos 2x cos "" x/2 -cos 3x cos " (9x)/(2) = sin 5x sin ""(5x)/(2).

Prove that cos 2x cos "" x/2 -cos 3x cos " (9x)/(2) = sin 5x sin ""(5x)/(2).

Prove that cos 2 x cos ""x/2 - cos 3x cos ""(9x)/(2) = sin 5x sin ""(5x)/(2)