# pre-calculus

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Question description

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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