Evaluate the following (i) `sin 60^ cos30^ + sin 30^ cos 60^` (ii) `2tan^2 45^ + cos^2 30^ - sin...
485 views · Published 20 July 2018 · 6:14 · Indexed 26 September 2026
Channel: Doubtnut · 2018 · Education
Question From - NCERT Maths Class 10 Chapter 8 EXERCISE 8.2 Question – 1 INTRODUCTION TO TRIGONOMETRY CBSE, RBSE, UP, MP, BIHAR BOARD QUESTION TEXT:- Evaluate the following (i) `sin 60^ cos30^ + sin 30^ cos 60^` (ii) `2tan^2 45^ + cos^2 30^ - sin^2 60^` (iii) `(cos45^)/(sec30^ + c o s e c 30^)` (iv) `(sin30^ + tan45^ - c o s e c 60^ )/(sec30^ + cos60^ +cot45^)` (v) `(5cos^2 60^ + 4sec^2 30^ - tan^2 45^ )/ (sin^2 30^ + cos^2 30^ ) ` Doubtnut के साथ १००% मार्क्स पायें, आज ही डाउनलोड करें :- https://doubtnut.app.link/91GzfmKxjP Related Questions & Solutions: 1. Choose the correct option and justify your choice : (i) `(2tan30^)/(1+tan^2 30^)` `(a) sin 60^ (b) cos 60^ (c) t a n 60^ (d) sin 30^`... https://youtu.be/A5ZbFtRazms 2. If `tan(A+B)=sqrt(3)` and `t a n(A- B)=1/(sqrt(3)),` `0^ le A + B le 90^ a le B ,` find A and B.... https://youtu.be/D5X0Wz7sJBk 3. State whether the following are true or false. Justify your answer. (i) `sin(A+B)=sinA+sin B` . (ii) The value of `sintheta` increases as `theta` increases. (iii) The value of `costheta` increases as ... https://youtu.be/DgXPRMUSU_k Get Classwise & Chapterwise Definitions & Solutions from NCERT Book: • NCERT Solutions for class 6th to class 12th Maths - https://doubtnut.com/ncert-solutions • NCERT Solutions for Class 10 - https://doubtnut.com/ncert-solutions/class-10-maths-1 • NCERT Solutions for Class 10, Chapter 8 - https://doubtnut.com/ncert-solutions/class-10-maths-chapter-8-introduction-to-trigonometry-1 Score 100% With Doubtnut Prepare your class 10 subjects with our intuitive video solutions and score well in your final academic exam 2019-20. Students can click the doubt question from their text book of class 10 maths, science and find instant video solutions on our renowned doubt solving app or even on our website. Subscribe our channel for latest and trending videos on various topics from subjects like – Maths, Physics, Chemistry, Biology etc for Board & higher studies. Doubtnut ऍप पर आप कक्षा ६ से १२ (IIT JEE तक) के NCERT के गणित/ भौतिक विज्ञान/रसायन विज्ञान/जीव विज्ञान/ के सभी सवालों के वीडियो देखिये और मुफ्त में खोजिये किसी भी गणित सवाल का जवाब - 5 लाख से भी ज़्यादा सवालों के जवाब हैं Doubtnut ऍप पर Doubtnut App and website has video solutions of ALL the NCERT questions from Class 6 to 12. You can download the NCERT solutions in pdf format too. Student can prepare for IIT JEE at https://doubtnut.com/iit-solutions, where questions from popular books of Math, Physics, Chemistry , Biology are solved for easy and swift learning. Doubtnut app provides free online video solutions that help students to better understand each topic and retain what they have learnt for a longer duration. It further helps in creating a stronger foundation for future classes. You can also ask any question related to Math, Physics, Chemistry, Biology and get a video solution for FREE from a library of more than 5 Lakhs Videos Follow Us On Facebook https://www.facebook.com/doubtnut
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