In right ∆QRS, Angles Q and R are the acute angles. If tan Q = √51/7, determine cos R.   √51/10 ≈ 0.7141     7/√51 ≈ 0.9802     2/√51 ≈ 0.2801     7/10 = 0.7000

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A: topic- trigonometric ratios and formulas

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