Evaluate without using trigonometric tables, \sin ^2 28^{\circ}+ \sin ^2 62^{\circ}+\tan ^2 38^{\circ}-\cot ^2 52^{\circ}+\frac{1}{4} \sec ^2 30^{\circ}

ICSE Class X Math 2017 Solved Paper - Question 4

Question : 4 of 31

Marks: +1, -0

Evaluate without using trigonometric tables,

sin \;^2 28^{∘}+ sin \;^2 62^{∘}+\tan ^2 38^{∘}-\cot ^2 52^{∘}+\;{1}/{4} \ sec ^2 30^{∘}

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