NCERT Solutions for Class 10 Maths Chapter 8 Introduction to Trigonometry Ex 8.4 are part of NCERT Solutions for Class 10 Maths. Here we have given NCERT Solutions for Class 10 Maths Chapter 8 Introduction to Trigonometry Ex 8.4.

- Introduction to Trigonometry Class 10 Ex 8.1
- Introduction to Trigonometry Class 10 Ex 8.2
- Introduction to Trigonometry Class 10 Ex 8.3
- Introduction to Trigonometry Class 10 Ex 8.4

Board |
CBSE |

Textbook |
NCERT |

Class |
Class 10 |

Subject |
Maths |

Chapter |
Chapter 8 |

Chapter Name |
Introduction to Trigonometry |

Exercise |
Ex 8.4 |

Number of Questions Solved |
5 |

Category |
NCERT Solutions |

## NCERT Solutions for Class 10 Maths Chapter 8 Introduction to Trigonometry Ex 8.4

**Question 1.**

**Express the trigonometric ratios sin A, sec A and tan A in terms of cot A.**

**Solution:**

**Question 2.**

**Write all the other trigonometric ratios of ∠A in terms of sec A.**

**Solution:**

**Question 3.**

**Evaluate:**

**Solution:**

**Question 4.**

**Choose the correct option. Justify your choice.**

**(i) 9 sec² A – 9 tan² A = ……**

**(A)** 1

**(B)** 9

**(C)** 8

**(D)** 0

**(ii) (1 + tan θ + sec θ) (1 + cot θ – cosec θ) = ………..**

**(A)** 0

**(B)** 1

**(C)** 2

**(D)** -1

**(iii) (sec A + tan A) (1 – sin A) = ………….**

**(A)** sec A

**(B)** sin A

**(C)** cosec A

**(D)** cos A

**(iv) = ………..**

**(A)** sec² A

**(B)** -1

**(C)** cot² A

**(D)** tan² A

**Solution:**

**Question 5.**

**Prove the following identities, where the angles involved are acute angles for which the expressions are defined.**

**Solution:**

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