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Question in-tri

4.2 Right Triangles & Trigonometry - Trig ratios (sin, cos, tan) in right triangles
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The figure presents right triangle R S T such that side R T is horizontal, vertex T is to the right of vertex R, and vertex S is above R T. Side R S is labeled 12. Side S T is labeled 5. Angle S is a right angle

In triangle RST above, point W (not shown) lies on line segment R T. What is the value of cosine of angle R S W, minus sine of angle W S T ?

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