Sin^2+cos^2 = 1 then cos^2 + cos^4 =??

1.	Sin^2+cos^2 = 1 then cos^2 + cos^4 =??
Answer» ong>Step-by-step explanation: SINA+sin 2 A=1⇒sinA=1−sin 2 A⇒(sinA) 2 =(COS 2A) 2 ⇒sin 2 A=cos 4 A⇒1−cos 2A=cos 4A⇒cos 2 A+cos 4 A=1

Answer»

ong>Step-by-step explanation:

SINA+sin 2 A=1⇒sinA=1−sin 2 A⇒(sinA) 2 =(COS 2A) 2

⇒sin 2 A=cos 4 A⇒1−cos 2A=cos 4A⇒cos 2 A+cos 4 A=1

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Sin^2+cos^2 = 1 then cos^2 + cos^4 =??​

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Sin^2+cos^2 = 1 then cos^2 + cos^4 =??