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Introduction To Trigonometry – Class X – Part 4 | Exercise 8.2 Q1 Solved

Watch the fourth video session on “Introduction To Trigonometry” for Class Xth – concepts and solved questions

Introduction To Trigonometry – Class X – Part 4

1. How to remember trigonometric ratios for specific angles: 0°, 30°, 45°, 60°, 90°:

a) Just remember the values for Sin of the angles.
b) The values for Cos will be in reverse order of Sin of the angles.
c) Tan of angle = Sin of angle/ Cos of angle
d) Cosec is reciprocal of Sin.
e) Sec is reciprocal of cos.
f) Cot is reciprocal of tan.

NCERT Exercise 8.2 Q1 Solved

1. Evaluate the following :

(i) sin 60° cos 30° + sin 30° cos 60°

(ii) 2 tan245° + cos230° – sin260°

(iii) cos 45° / (sec 30° + cosec 30°)

(iv) (sin 30° + tan 45° – cosec 60°) / (sec 30° + cos 60° + cot 45°)

(v) (5 cos260° + 4 sec230° – tan245°)/ (sin2 30° + cos230°)

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