Question

cos^ 2 A + cos ^4= 1 then find , tan ^ 2A + tan^ 4 =​

Answer 1

cos A+cos^2 A=1 ————(1)

cos A =1-cos^2 A

[sin^2 A=1- cos^2 A]

If cos A+cos²A=1, then prove that

(sin^2 A) + (sin^2 A)^2=1

sin^2 A + sin^4 A=1 [Proved]