" 11."7a^(x)+3a cos(9x+2)

The sum of 5x^(2) ,7x^(2) ,8x^(2) ,11x^(2) and 9x^(2) is …………..

The number of solutions of 12 cos^(3) x-7 cos^(2) x+4 cos x=9 is

The number of solutions of 12 cos^(3) x-7 cos^(2) x+4 cos x=9 is

The number of solutions of 12 cos^(3) x-7 cos^(2) x+4 cos x=9 is

Prove that cos 2xcos(x/2)-cos 3x cos((9x)/2)= sin5x sin((5x)/2) .

cos x cos((x)/(2))-cos3x cos((9x)/(2))=sin7x sin8x

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

Evaluate lim_(x to sqrt(3)) (3x^(8) + x^(7) - 11x^(6) - 2x^(5) 9x^(4) - x^(3) + 35x^(2) + 6x + 30)/(x^(5) - 2x^(4) + 4x^(2) - 9x + 6)