NCERT Solutions for class 10 Maths Chapter 8 Exercise 8.4 Introduction to Trigonometry PDF in Hindi Medium and English Medium for all board whoever using NCERT Books for their CBSE based exams. Download (Exercise 8.4) here in PDF form or use the solutions and proof given below as online.

## NCERT Solutions for class 10 Maths Chapter 8 Exercise 8.4

### Class 10 Maths Chapter 8 Exercise 8.4 Proof and Solutions in English

NCERT Solutions for class 10 Maths Chapter 8 Exercise 8.4 Introduction to Trigonometry in English Medium free to use online and liberty to download for offline use. Click here to move Class 10 Maths Chapter 8 for other exercises whether download or online study. CLICK HERE for Hindi Medium Solutions. **CLICK HERE TO SEE THIS PAGE IN PROPER FORMAT**.

### Class 10 Maths Chapter 8 Exercise 8.4 Proof and Solutions in Hindi

NCERT Solutions for class 10 Maths Chapter 8 Exercise 8.4 Introduction to Trigonometry in Hindi Medium with complete description of each questions along with reason of each step. All questions are done by the qualified and expert teachers to provide the best for the students. Click here to move Class 10 Maths Chapter 8 for other exercises whether download or online study. Go back to English Medium Solutions.

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#### Important Extra Questions on Trigonometric Identities for Proof

- If A, B, C are the angles of triangle ABC then prove that cosec2[(B + C)/2] – tan2(A/2) = 1.
- Prove the following: 2 (sin^6 A + cos^6 A) – 3 (sin^4 A + cos^4 A) + 1 = 0
- Prove that: (1 + cot A + tan A) (sin A – cos A) = sin A tan A – cot A cos A
- If sin θ + cos θ = m and sec θ + cosec θ = n then show that n(m² – 1) = 2m.
- If time bound and continuity are two measurable quantities respectively equal to A & B. If sin (A – B) = 1/2, cos(A + B) = 1/2, where 0° < A + B ≤ 90° find the values of A and B. [Answer: A = 45, B = 15]
- If x = sin²θ, y = cos²θ, where x & y represents honesty and hard work. (a) What will be the result after joining honesty & hard work? (b) Which mathematical concept has been used here? [Answer: (a) 1, (b) Trigonometry]

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