# Selina Concise Mathematics Class 10 ICSE Solutions Trigonometrical Identities

## Selina Concise Mathematics Class 10 ICSE Solutions Trigonometrical Identities (Including Trigonometrical Ratios of Complementary Angles and Use of Four Figure Trigonometrical Tables)

Selina Publishers Concise Mathematics Class 10 ICSE Solutions Chapter 21 Trigonometrical Identities (Including Trigonometrical Ratios of Complementary Angles and Use of Four Figure Trigonometrical Tables)

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

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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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