Selina Class 10 ICSE Solutions Mathematics : Chapter 21- Trigonometrical Identities

Class 10: Maths Chapter 21 solutions. Complete Class 10 Maths Chapter 21 Notes.

Selina Class 10 ICSE Solutions Mathematics : Chapter 21- Trigonometrical Identities

Selina 10th Maths Chapter 21, Class 10 Maths Chapter 21 solutions

Exercise 21A

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Question 10.

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Question 11.

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Question 12.

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Question 21.

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Exercise 21B

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Exercise 21C

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Question 10.

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Question 11.

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Question 12.
Without using trigonometrical tables, evaluate:
cosec² 57° – tan²33° + cos 44° cosec46° – \sqrt{2}2–√cos45° – tan²60°
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Exercise 21D

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Exercise 21E

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Question 9.

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Question 10.
\frac{\cot A-1}{2-\sec ^{2} A}=\frac{\cot A}{1+\tan A}cotA−12−sec2A=cotA1+tanA
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To prove that : \frac{\cot A-1}{2-\sec ^{2} A}=\frac{\cot A}{1+\tan A}cotA−12−sec2A=cotA1+tanA

Hence proved.

Question 11.

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Question 12.

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Question 13.

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Question 14.

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Question 15.

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Question 16.

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Question 17.
Evaluate without using trigonometric tables,
sin² 28° + sin² 62° + tan² 38° – cot² 52° + \frac{1}{4}14sec² 30°
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Selina Class 10 ICSE Solutions Mathematics : Chapter 21- Trigonometrical Identities

Download PDF: Selina Class 10 ICSE Solutions Mathematics : Chapter 21- Trigonometrical Identities PDF

Chapterwise Selina Publishers ICSE Solutions for Class 10 Maths :

• Chapter 1 - GST (Goods and Services Tax)
• Chapter 2 - Banking (Recurring Deposit Accounts)
• Chapter 3 -Shares and Dividends
• Chapter 4 - Linear Inequations (in one variable)
• Chapter 5 - Quadratic Equations
• Chapter 6 - Solving Simple Problems (Based on Quadratic Equations)
• Chapter 7 - Ratio and Proportion (Including Properties and Uses)
• Chapter 8 - Remainder and Factor Theorems
• Chapter 9 - Matrices
• Chapter 10- Arithmetic Progression
• Chapter 11- Geometric Progression
• Chapter 12- Reflection
• Chapter 13 - Section and Mid-Point Formula
• Chapter 14- Equation of a Line
• Chapter 15- Similarity
• Chapter 16- Loci (Locus and Its Constructions)
• Chapter 17- Circles
• Chapter 18- Tangents and Intersecting Chords
• Chapter 19- Constructions (Circles)
• Chapter 20- Cylinder, Cone and Sphere
• Chapter 21- Trigonometrical Identities
• Chapter 22- Heights and Distances
• Chapter 23- Graphical Representation
• Chapter 24- Measures of Central Tendency
• Chapter 25- Probability

About Selina Publishers ICSE

Selina Publishers has been serving the students since 1976 and is one of the quality ICSE school textbooks publication houses. Mathematics and Science books for classes 6-10 form the core of our business, apart from certain English and Hindi literature as well as a few primary books. All these books are based upon the syllabus published by the Council for the I.C.S.E. Examinations, New Delhi. The textbooks are composed by a panel of subject experts and vetted by teachers practising in ICSE schools all over the country. Continuous efforts are made in complying with the standards and ensuring lucidity and clarity in content, which makes them stand tall in the industry.