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3. Given that tanθ = −1/3, and cosθ > 0, find sin2θ, cos2θ, and tan2θ.
4. Use the appropriate Half-Angle Formula to find the exact value of each expression.
a) sin15
◦b) sin157.5◦
c) cos 11π/8
5. Find the general solution of cos θ = − 1/2
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