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28 February, 21:16

Simplify the expression 16 - x2 as much as possible after substituting 4 sin θ for x. (assume 0° < θ < 90°.)

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  1. 28 February, 22:40
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    16 - (4*sinθ) ^2

    16 - 16*sinθ^2

    16 (1 - sinθ^2)

    16*cosθ^2
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