sin²theta+cos⁴theta/sin⁴theta+cos²theta = indentify
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Just convert like this
(1-cos^2A) + cos^4A / sin^4A + (1-sin^2A)
=> 1 -cos^2A(1-cos^2A) / 1 -sin^2A(1-sin^2A)
=> 1-sin^2Acos^2A / 1-sin^2Acos^2A
=> 1
(1-cos^2A) + cos^4A / sin^4A + (1-sin^2A)
=> 1 -cos^2A(1-cos^2A) / 1 -sin^2A(1-sin^2A)
=> 1-sin^2Acos^2A / 1-sin^2Acos^2A
=> 1
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