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Problem 8 - Entrance Test
If sin θ + cos θ = 1.2, find sin 2θ.
A. 0.2
B. 0.36
C. 0.44
D. 0.64
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Correct: C
Square both sides: (sin θ + cos θ)^2 = 1.44 ⇒ sin²θ + 2 sin θ cos θ + cos²θ = 1.44 ⇒ 1 + sin 2θ = 1.44 ⇒ sin 2θ = 0.44.