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" 6."7a^(x)+3a cos(9x+2)...

" 6."7a^(x)+3a cos(9x+2)

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

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

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

a (x) = 3x ^ (6) + 7x ^ (4) + 9x ^ (2) + 2x + 1, b (x) = 2x + 2

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

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

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