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