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ICSE Class X Math 2014 Paper

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Question : 9 of 52
Marks: +1, -0
Without using trigonometric tables, evaluate
sin234+sin256+2tan18tan72\sin^2 34^{\circ} + \sin^2 56^{\circ} + 2 \tan 18^{\circ} \tan 72^{\circ} - cot230\cot^2 30^{\circ}
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