Question

trigonometry class 10 ​

Answer 1

option (ii)

→sin^4A-cos^4A

→(sin^2A)^2-(cos^2A)^2

→(sin^2A-cos^2A)(sin^2A+cos^2A)

→(sin^2A-Cos^2A)(1)

→(sin^2A-cos^2A)

Formula used

1) a^2-b^2=(a+b)(a-b)

Identity used

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

Hope it will help you.