If `cos4x=a_0+a_1cos^2x+a^2cos^4x` is true for all values of `x in R ,` then the value of `5a_0+a_1+a_2` is_______

If cos4x=1+k sin^(2)x cos^(2)x, then write the value of k

If cosx=a_0+a_1 x+a_2x^2+... then the value of a_2 is

If cos^(2)x+cos^(4)x=1 , then find the value of tan^(2)x+tan^(4)x .

If 4x+8cos x+tanx-2 sec x-4 log {cos x(1+sinx)}ge 6 for all x in [0, lambda) then the largest value of lambda is

If Ine^(2cos^(2)x-1)=cos x, for 0

if lim_(x rarr0)(1+a cos2x+b cos4x)/(x^(4)) exists for all x in R and has the value equal to c. Find the value of 3(a+b+c)

5(tan^(2)x-cos^(2)x) = 2cos2x +9 , then the value of cos4x is:

If 5(tan^(2)x-cos^(2)x)=2cos2x+9, then the value of cos4x is

If cot^(4)x-cot^(2)x=1 , then the value of cos^(4)x+cos^(2)x is ________