Solved problems on Trigonometric Ratios of Complementary Angles and trigonometric identities

http://www.learncbse.in/ncert-class-10-math-solutions/

http://www.learncbse.in/ncert-solutions-for-class-10-maths-chapter-8-introduction-to-trigonometry/

http://www.learncbse.in/rd-sharma-class-10-solutions-chapter-5-trigonometric-ratios/

In this video we evaluate a trigonometric expression by using trigonometric ratios of complementary angles. This is really simple. In such problems we have to make same numerator & denominator by using the trigonometric ratios of complementary angles relationship.

solve problems based on trigonometric ratios of complementary angles

Trigonometry - The Complementary Angle Theorem

use some trigonometric ratios of complementary angle

00:02 CBSE class 10 maths NCERT Solutions Chapter 8 Trigonometry Exercise 8.4 Q3(2)

00:55 Trigonometric Ratios of Complementary Angles

Two angles are said to be complementary if their sum equals 90° pair of complementary angles A and 90° – A .

sin (90° – A) = cos A, cos (90° – A) = sin A ,

02:44 CBSE class 10 maths NCERT Solutions Chapter 8 Trigonometry Exercise 8.4 q4. Choose the correct option. Justify your choice.

02:48 Solve trigonometric expressions (i)

03:15 Use Pythagorian Identity

secant squared theta minus tan squared theta = 1

03:28 Solve trigonometric expressions(ii)

substitute the given angles

04:16 simplifying radicals

04:45 Solve trigonometric expressions(iii)

05:10 reciprocal identity

05:54 Use Pythagorian Identity

sin squared theta plus cos squared theta = 1

06:24 Solve trigonometric expressions(iv)

06:45 reciprocal identity

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CBSE solutions for class 10 maths Chapter 8 Trigonometry Exercise 8.3

CBSE class 10 maths NCERT Solutions Chapter 8 Trigonometry Exercise 8.4 | Trigonometric Identities

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