If `tan x=(3)/(4)` ,then find the value of `cos2x`

If tan ^(-1).(3)/(4)=x , the find the value of sec x.

If tan x =1(1)/3 , find the value of : 4 sin^2x -3 cos^2x +2

If tan1^(@)tan2^(@)tan3^(@)tan4^(@). . .tan89^(@)=x^(2)-8 , then find the value of x.

If cos^(-1).(6x)/(1 + 9x^(2)) = -(pi)/(2) + 2 tan^(-1) 3x , then find the values of x

If tan(cos^(-1) x) = sin (cot^(-1).(1)/(2)) , then find the value of x

If the sum of all value of x satisfying the system of equations tan x + tan y+ tan x* tan y=5 sin (x +y)=4 cos x * cos y is (k pi )/2 , where x in (0, (pi)/(2)) then find the values of k .

If tanx=3/4, piltxlt(3pi)/2, find the value of sin(x/2) , cos(x/2), tan(x/2)

If int tan^(2) kx dx= (tan 3x)/(3)-x + C , find the value of k

If sinx+sin^2x+sin^3x=1 then find the value of cos^6x-4cos^4x+8cos^2x

If sinx+sin^2x+sin^3x=1 then find the value of cos^6x-4cos^4x+8cos^2x