Question

If sinA + sinsquare A = 1 , then cossquare A+ cosfourth A = ?​

Answer 1

Answer:

cos^2A+cos^4A=1

Step-by-step explanation:

sinA+sin^2A=1

sinA=1-sin^2A

sinA=cos^2A

squaring on both sides

sin^2A=cos^4A

Now cos^2A+cos^4A=sinA+sin^2A=1