Without using trigonometrical tables, evaluate : {\cosec}^2 57^{\circ}-\tan ^2 33^{\circ}+\cos 44^{\circ} {\cosec} 46^{\circ} -\sqrt{2}\cos 45^{\circ}-\tan ^2 60^{\circ}.

ICSE Class X Math 2016 Solved Paper - Question 6

Question : 6 of 57

Marks: +1, -0

Without using trigonometrical tables, evaluate :

{\cosec}^2 57^{∘}-\tan ^2 33^{∘}+\cos 44^{∘} {\cosec} 46^{∘}

-{√{2}}\cos 45^{∘}-\tan ^2 60^{∘}

Solution:

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