Prove that cos pi/11 + cos 3pi/11 + cos 5pi/11 + cos 7pi/11 + cos 9pi/11...

A elegant solution for a difficult trigonometric problem using complex numbers. Many problem of trigonometry and even algebra can be beautifully solved using complex numbers. The use of different formulas from trigonometry can be avoided. #CBSE #ISC #IIT #ISI #wbjee #wbchse #jeeadvanced Prove that cos pi/11 + cos 3pi/11 + cos 5pi/11 + cos 7pi/11 + cos 9pi/11 =1/2

Trigonometry SN Dey Solved Problems - HS - Class XI

1. Trigonometric functions of Standard Angles [ 4 and 5 marks ]

2. Trigonometric functions of Associate Angles [ 4 and 5 marks ]

3. Trigonometric transformations of sums and products [ 4 and 5 marks]

4. Trigonometric functions of Compound Angles [ 4 and 5 marks]

5. Trigonometric functions of Multiple Angles [4 and 5 marks]

6. Trigonometric functions of Sub-multiple Angles [ 4 and 5 marks]

7. Trigonometric Equations  [ 4 and 5 marks]

Trigonometry: Solved Problems

Solutions of Triangle is an important topic in the JEE Main and JEE Advanced and in class XI for CBSE and other state boards in India. This topic comprises various formulae and rules like the sine rule, cosine rule, tangent rule etc. Questions based on the application of these formulas are often asked in exams. Revising these problems will help students to remember them and easily solve other questions of similar type and also apply their learning to new problems:

Solved Problems from the Book of S.L Loney Plane Trigonometry: CLICK HERE

More Problems to follow soon :) 

TRIGONOMETRY : TRIGONOMETRICAL RATIOS SOLVED PROBLEMS FOR 10TH GRADE CBSE ICSE OTHER STATE BOARDS

 

TRIGONOMETRY : TRIGONOMETRICAL RATIOS SOLVED PROBLEMS FOR 10TH GRADE ( CBSE, ICSE AND OTHER STATE BOARDS). SUBSCRIBE FOR MORE SOLVED PROBLEMS WHICH WILL BE UPLOADED SOON.

Trigonometric ratios are the ratios between edges of a right triangle. These ratios are given by the following trigonometric functions of the known angle A, where a, b and c refer to the lengths of the sides in the accompanying figure:

• Sine function (sin), defined as the ratio of the side opposite the angle to the hypotenuse.

${\displaystyle \sin A={\frac {\textrm {opposite}}{\textrm {hypotenuse}}}={\frac {a}{c}}.}$

• Cosine function (cos), defined as the ratio of the adjacent leg (the side of the triangle joining the angle to the right angle) to the hypotenuse.

${\displaystyle \cos A={\frac {\textrm {adjacent}}{\textrm {hypotenuse}}}={\frac {b}{c}}.}$

• Tangent function (tan), defined as the ratio of the opposite leg to the adjacent leg.

${\displaystyle \tan A={\frac {\textrm {opposite}}{\textrm {adjacent}}}={\frac {a}{b}}={\frac {a/c}{b/c}}={\frac {\sin A}{\cos A}}.}$

If you have any query feel free to connect us at any of the following platforms. Free help for your queries. Helping Students! Feel free to send your problems. Follow us on the most popular platforms. Whatsapp: +91-9038126497

Facebok: https://facebook.com/prime.maths Instagram: https://instagram.com/prime.maths YouTube: https://YouTube.com/c/PrimeMaths Twitter: https://twitter.com/prime_maths Telegram: https://t.me/PrimeMaths

Relations and Functions

Solved problem form the unit Relations and Functions and Inverse trigonometric Functions at 10+2 level. Here you will find numerous solved problems covering all aspects of the chapter. Learn through the method of problem solving. Variety of problem across all major boards in India. (CBSE, ISC, WBHSE and other State Boards). If you have any query just comment in the comment box.

Worksheet - Relations

Solved Problems - Relations 

Solved Problems -Functions  

Solved Problems- Binary Relations

Inverse Trigonometric Functions - Set I 

Inverse Trigonometric Functions - Set II

Try out this challenge from #Algebra.

Posted by Prime Maths on Tuesday, 25 August 2020

Trigonometry: Elimination Problem

Solved Trigonometry Problems: 10th Grade

Here is a list of few good problems at the 10th grade. Get the full solution below and if you want
more comment or mail us at maths.programming@gmail.com!


Download here

Problems for WBJEE and AIEEE

 MCQ and Short Type Questions for various topics  ( relation, functions, derivative, matrices, determinants, trigonometry, inverse, circular Co-ordinate, geometry, two-dimension, tangent, normal) Download