sin4 theta + cos4 theta + 2 cos2 theta + 2 sin2 theta
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Answer:
Step-by-step explanation:
sin4 theta + cos4 theta + 2 cos^2 theta + 2 sin^2 theta
= (sin4 theta + cos4 theta) + 2 (cos^2 theta + sin^2 theta)
= 1 + 2 * 1
= 1 + 2
= 3
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