Class 10 maths lesson 1 part 8

1. Quality Education For All

2. Introduction to trigonometry- Trigonometric
Ratios Of Complementary Angles

3. sin (90° – A) = cos A
cos (90° – A) = sin A
tan (90° – A) = cot A
cot (90° – A) = tan A
sec (90° – A) = cosec A
cosec (90° – A) = sec A
Trigonometric Ratios Of Complementary Angles

4. Evaluate :
(i) sin 18°/cos 72°
(ii) cos 48° – sin 42°
Trigonometric Ratios Of Complementary Angles

5. Show that:
(i) tan 48° tan 23° tan 42° tan 67° = 1
Trigonometric Ratios Of Complementary Angles

6. IF TAN 2A = COT (A – 18°), WHERE 2A IS AN ACUTE
ANGLE, FIND THE VALUE OF A.
Trigonometric Ratios Of Complementary Angles

7. IF TAN A = COT B, PROVE THAT A + B = 90°.
Trigonometric Ratios Of Complementary Angles

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Trigonometric functions
Trigonometric functions