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

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

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

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

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

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

If 5 (tan ^(2) x - cos ^(2) x ) = 2 cos 2x +9 , then the value of cos 4 x is

6tan^(2)x-2cos^(2)x=cos2x if cos2x=

" If "sin^(2)x+sin x cos x-6cos^(2)x=0" and "-(pi)/(2)ltxlt0," then value of "cos2x" is " -3/5 3/5 -4/5 4/5

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