This math topic focuses on trigonometry, particularly practicing ratio manipulation within a broader unit on the fundamentals of trigonometry. The problems involve solving for an unknown variable represented as "?" in various trigonometric fraction expressions. Students are provided with options for each question and must manipulate the ratios correctly to identify the correct answer. The skills sharpened here are crucial for understanding relationships between angles and sides in right triangles and applications in various fields involving geometry and trigonometry.
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Solve the fraction for the '?' in terms of the variables.