B. 4/5 / 4/5
ExplanationStep 1: sec θ is reciprocal of cos θ. Step 2: If sec θ = 5/4 then cos θ = 4/5. Step 3: Remember reciprocal ratios in pairs.
Step 1: sec θ cos θ का reciprocal होता है। Step 2: sec θ = 5/4 होने पर cos θ = 4/5। Step 3: Reciprocal ratios को pair में याद करें।
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