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| f Find the value of sin 90°, using the double-angle formula. f |
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| f Using the double-angle formula, find the value of cos 120°. f |
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| f Using the double angle formula, find the value of tan 120°. f |
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f If sin θ = 725 and θ is in first quadrant, then find the exact value of cos 2θ.
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| f If sin A = 35 and 0° < ∠A < 90°, then what is the value of sin 2A? f |
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f If 90° < ∠B < 180° and sin B = 1213, then find the value of tan 2B.
f |
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| f If tan B = - 13 and 90° < ∠B < 180°, then the value of cos 2B is: f |
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| f If 180° < θ < 270° and sin θ = - 13, then find the value of sin 2θ. f |
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| f If ∠C is in fourth quadrant and cos C = 2425, then find the value of cos 2C. f |
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| f Using half-angle formula, the value of sin 15° is: f |
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f Using half angle formula, the exact value of cos 75° is:
f |
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| f Choose the value of tan 150° from the following. f |
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f If 0° < θ < 90° and sin θ = 1213, then the exact value of sin θ2 is:
f |
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f If 90° < ∠B < 180° and sin B = 45, then the exact value of cos B2 is _________.
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| f If ∠ A is in third quadrant and cos A = - 513, then the exact value of cos A2 is: f |
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| f If 270° < ∠ C < 360° and cos C = 35, then the value of tan C2 is: f |
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| f If 180° < θ < 270° and cos θ = - 2425, then the exact value of sin 2θ is: f |
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| f Choose the formula that corresponds to the value of cos 4θ. f |
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f Using double-angle formulas, choose the formula that corresponds to the value of sin 6θ.
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| f Using the half-angle formula, write a formula for cos (A4). f |
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| f In right triangle ABC, if ∠B = 90°, then cos2 (C2) = ? f |
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| f Write cos 2θ in terms of tan θ using double-angle formula. f |
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| f Using half-angle formula, find the value of tan 15°. f |
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