Without using trigonometric tables, evaluate \sin ^2 34^{\circ}+ \sin ^2 56^{\circ}+2 \tan 18^{\circ} \tan 72^{\circ}- \cot^230^\circ

ICSE Class X Math 2014 Solved Paper - Question 9

Question : 9 of 52

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Without using trigonometric tables, evaluate

\sin \;^2 34^{∘}+ \sin \;^2 56^{∘}+2 \tan 18^{∘} \tan 72^{∘}-

\cot^230°

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