Class 10 Maths Trigonometrical Identities Solutions

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• Area Related to Circles Class 10 Formulas
• Surface Areas and Volumes Class 10 Formulas
• Constructions Class 10 Formulas
• Circles Class 10 Formulas
• Introduction to Trigonometry Class 10 Formulas
• Coordinate Geometry Class 10 Formulas
• Arithmetic Progression Class 10 Formulas
• Quadratic Equations Class 10 Formulas
• Pair Of Linear Equations in Two Variables Class 10 Formulas
• Polynomials Class 10 Formulas
• Real Numbers Class 10 Formulas
• Triangles Class 10 Formulas
• Some Applications of Trigonometry Class 10 Formulas
• Statistics Class 10 Formulas
• Probability Class 10 Formulas

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Trigonometrical Identities Exercise 21B – Selina Concise Mathematics Class 10 ICSE 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 21D – Selina Concise Mathematics Class 10 ICSE Solutions

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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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