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Answer» Tan35°×Tan55°=Sina......(1)now Tan55°=Tan(90°-35°)=Cot35°And Cot35°=1/tan35°From (1)tan35×tan55=Sina put the value of tan 55tan35×1/tan35=SinaThis shows that 1 = Sinahence Sina =sin 90hence a =90° tan (35°) tan(55°) tan (35°) tan(90 - 35°) tan(35°) cot (35°) tan(35°) × 1/(tan(35°)) 1 So, sin a = 1a = 90° option (c) is correct |
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