\frac{\sin \theta}{1 + \sec \theta} \cdot \frac{1 - \sec \theta}{1 - \sec \theta}
Added by Peggy R.
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Therefore, 1 + secθ = 1 + 1/cosθ = (cosθ + 1)/cosθ and 1 - secθ = 1 - 1/cosθ = (cosθ - 1)/cosθ. Show more…
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