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Mathematics
Mathematics
Problem
Prove that
(
cos
θ
+
sin
θ
)
2
≡
sin
2
θ
+
1
(\cos \theta + \sin \theta)^2 \equiv \sin 2\theta + 1
(
cos
θ
+
sin
θ
)
2
≡
sin
2
θ
+
1
.
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