`cos4A=8cos^(4)A-8cos^(2)A+1`.

cos4A=1-8cos^(2)A+8cos^(4)A

Prove that: cos4A=1-8cos^(2)A+8cos^(4)A

If sinA+sin^(2)A=1 , then find the value of cos^(12)A+3cos^(10)A+3cos^(8)A+cos^(6)A+cos^(4)A+cos^(2)A .

Show tha: cos4A=1-8cos^2A+8cos^4A .

If sin A+sin^(2)A+sin^(3)A=1, then find the value of cos^(6)A-4cos^(4)A+8cos^(2)A

If sin A + sin^(2)A + sin^(3)A =1 , then , prove that cos^(6) A - 4 cos^(4) A + 8 cos^(2) A =4 .

Find the general solution of the trigonometric equation sqrt(16cos^(4)x-8cos^(2)x+1)+sqrt(16cos^(4)x-24cos^(2)x+9)=2

Find the general solution of the trigonometric equation sqrt(16cos^(4)x-8cos^(2)x+1)+sqrt(16cos^(4)x-24cos^(2)x+9)=2

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

Prove that: cos4A=1-8cos^2\ A+8cos^4\ A