## myCBSEguide App

**Complete Guide for CBSE Students**

NCERT Solutions, NCERT Exemplars, Revison Notes, Free Videos, CBSE Papers, MCQ Tests & more.

Download Now

NCERT Solutions for Class 10 Maths Exercise 8.4 Class 10 Maths book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE board exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. Class 10 Maths chapter wise NCERT solution for Maths Book for all the chapters can be downloaded from our website and myCBSEguide mobile app for free.

**NCERT solutions for Maths ****Introduction to Trigonometry ****Download as PDF**

## NCERT Solutions for Class 10 Maths Introduction to Trigonometry

**1. Express the trigonometric ratios and in terms of **

**Ans. **For

By using identity

For

By using identity

=

For

**2. Write the other trigonometric ratios of A in terms of **

**Ans. **For

By using identity,

=

For

For

By using identity

For

=

For

NCERT Solutions for Class 10 Maths Exercise 8.4

**3. Evaluate:**

**(i) **

**(ii) **

**Ans. (i)**

=

=

=

**(ii)**

=

=

= = 1

NCERT Solutions for Class 10 Maths Exercise 8.4

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

**(i) =**

**(A) 1**

**(B) 9 **

**(C) 8 **

**(D) 0**

**(ii) =**

**(A) 0**

**(B) 1 **

**(C) 2 **

**(D) none of these**

**(iii) =**

**(A) **

**(B) **

**(C) **

**(D) **

**(iv) =**

**(A) **

**(B) **

**(C) **

**(D) none of these**

**Ans. (i) (B)**

=

=

**(ii)** **(C)**

=

=

=

=

=

= = 2

**(iii)(D)**

=

=

= =

=

**(iv)(D)** =

= =

= =

NCERT Solutions for Class 10 Maths Exercise 8.4

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

**(i) **

**(ii) **

**(iii) **

**(iv) **

**(v) , using the identity **

**(vi) **

**(vii) **

**(viii) **

** **

**(ix) **

** **

**(x) **

**Ans. (i) **L.H.S.

=

=

=

=

=

=

=

= = R.H.S.

**(ii) **L.H.S.

=

=

=

= =

= = = R.H.S

**(iii) **L.H.S.

=

=

=

=

=

=

=

= =

=

**(iv) **L.H.S.

= =

=

=

= = R.H.S.

**(v) **L.H.S.

Dividing all terms by

= =

=

=

=

= = R.H.S.

**(vi) **L.H.S.

=

=

=

= =

= = R.H.S.

**(vii) **L.H.S.

=

=

=

= =

= = R.H.S

**(viii) **L.H.S.

=

=

=

=

=

=

=

= R.H.S.

**(ix) **L.H.S.

=

=

= =

=

Dividing all the terms by ,

=

=

= = R.H.S.

**(x) **L.H.S. =

= = = R.H.S.

Now, Middle side = =

=

= =

= = R.H.S.

## NCERT Solutions for Class 10 Maths Exercise 8.4

NCERT Solutions Class 10 Maths PDF (Download) Free from myCBSEguide app and myCBSEguide website. Ncert solution class 10 Maths includes text book solutions from Mathematics Book. NCERT Solutions for CBSE Class 10 Maths have total 15 chapters. 10 Maths NCERT Solutions in PDF for free Download on our website. Ncert Maths class 10 solutions PDF and Maths ncert class 10 PDF solutions with latest modifications and as per the latest CBSE syllabus are only available in myCBSEguide.

** Download CBSE Question Paper 2018**

**Download CBSE Question Paper 2018**

## CBSE app for Class 10

To download NCERT Solutions for Class 10 Maths, Computer Science, Home Science,Hindi ,English, Social Science do check myCBSEguide app or website. myCBSEguide provides sample papers with solution, test papers for chapter-wise practice, NCERT solutions, NCERT Exemplar solutions, quick revision notes for ready reference, CBSE guess papers and CBSE important question papers. Sample Paper all are made available through **the best app for CBSE **

## Test Generator

Create Papers with your Name & Logo

Try it Now (Free)
It is having a good solution

Worst experience, the answers doesnot appear. Only showing a blank white box!

Thankyou so much…….

Ex 8.4 Q5 part ix: it can also be done by solving l.h.s and r.h.s

Thank u… solutions appear good

Thank you… Solutions appear good

it helped me alot

All solutions are correct and easy to understand.

Well good

Well that’s good

it helped me a lot

NIC solutions.………

I love this. Easy form of solutions available

Love this solutions

Good help

It’s very helpful for me

All solutions are good and easy to understand . It’s good ..

Really helpfull

It helps me a lot….the answers are easy to understand

Thank you so much….

It really helped me a lot

Very nycly explained and clear answers.

It’s very hard solution

Thanks

Bhai apne meri bahut madad ki

It is having a good solution All solutions are correct and easy to understand.

Thanks sooooooooo much

I love this solutions

it really helps

Leave

I like it ….

thank you for helping me

It is very helpful for me , thanks CBSE

Thanks for a short solutions

Thank u sir

Thanks you so much for these solutions

The Solution helps a lot….it’s very fabulous website.thank you CBSE guide….

Hmmm… Its good

Its too good and easy too understand…

Thank you so much.The solutions are very easy to understand.

The solve question is easy to understand .I like your website and way of solution

Nyc lesson……u have made it easy …..

Very nice explained and easy to solve with the of this

Good for everyone

Explained nicely easy to understand

Thanks

It is nice and easy to understand

Thanks?? it could help me

It is too easy to understood the answers

It’s too easy for study

All solutions are good and easy to understand . It’s good

Very good solutions and helping me

I like very much bcoz helpful for me

Good solution. It help me alot

Thanks for complete explanation

Thank you so much it is very good

Very good thanks

It’s nice

Thankyou so much for providing easy solutions of these tough exercise

Thankyou so much mycbseguide.com

Great solutions

Really nice

Really nice solution

Really nice solution

very nice ???? ???? ?????? ???? ???

Awesome??

It is really heaving good solutions that proved very beneficial….:)

Thnk u very much

Its helped a lot tq so much

Very simple and perfect solution

Some what hard but good answers it helped me a lot

Thank The Solutions

Amazing ?????

Amazing solution !

All solutions are helpful and easy to understand

Superb unbelievable I lost my eyes

Very nice work … Thank you so much