Solution
Expression : $$sin\theta + sin^2\theta = 1$$
=> $$sin\theta = 1 - sin^2\theta$$
=> $$sin\theta = cos^2\theta$$
To find : $$cos^2\theta + cos^4\theta$$
= $$cos^2\theta + (cos^2\theta)^2$$
= $$cos^2\theta + sin^2\theta$$
= 1
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