trigonometric-identities-and-trigonometric-ratios-of-complementary-angles-solved-problems

# Interactive video lesson plan for: Trigonometric Identities and Trigonometric Ratios of Complementary Angles Solved problems

#### Activity overview:

Trigonometric Identities and Trigonometric Ratios of Complementary Angles Solved problems

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/

00:03 NCERT Solutions for CBSE Class 10 Maths Trigonometry Ex 8.4 Q3. Evaluate :
00:31 (i)
01:03 COMPLEMENTARY ANGLES DEFINATION
Two angles are said to be complementary if their sum equals 90° pair of complementary angles A and (90° – A).
make same numerator & denominator by using the trigonometric ratios of complementary angles relationship.
sin (90°– A) = cos A, cos (90°– A) = sin A
02:57 Use Pythagorian Identity
sin squared theta plus cos squared theta = 1
03:37 (ii)
04:18 COMPLEMENTARY ANGLES
complementary angles are defined pair of two angles whose as sum equals 90°.
make same trigonometric ratios using trigonometric ratios of complementary angles relationship.
sin (90°– A) = cos A, cos (90°– A) = sin A
06:06 NCERT Solutions for CBSE Class 10 Maths Trigonometry Ex 8.4 Q4. Choose the correct option. Justify your choice.
06 :23 (i)
06:29 Use Pythagorian Identity
secant squared theta minus tan squared theta = 1
06:51 (ii)
substitute the given angles
08:15 (iii)
08:30 reciprocal identity
09:16 Use Pythagorian Identity
sin squared theta plus cos squared theta = 1
09:51 (iv)
10:08 reciprocal identity

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