# Class 10 Maths Trigonometrical Identities Solutions

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### Trigonometrical Identities Exercise 21C – Selina Concise Mathematics Class 10 ICSE Solutions

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Question 12.
Without using trigonometrical tables, evaluate:
cosec2 57° – tan233° + cos 44° cosec46° – $$\sqrt{2}$$cos45° – tan260°
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### Trigonometrical Identities Exercise 21E – Selina Concise Mathematics Class 10 ICSE Solutions

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Question 10.
$$\frac{\cot A-1}{2-\sec ^{2} A}=\frac{\cot A}{1+\tan A}$$
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To prove that : $$\frac{\cot A-1}{2-\sec ^{2} A}=\frac{\cot A}{1+\tan A}$$

Hence proved.

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Question 17.
Evaluate without using trigonometric tables,
sin2 28° + sin2 62° + tan2 38° – cot2 52° + $$\frac{1}{4}$$sec2 30°
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