Question

Question 1 Evaluate
(I) sin18 / cos72
(II) tan 26 / cot 64
(III) cos 48° − sin 42°
(IV)cosec 31° − sec 59°

Class 10 - Math - Introduction to Trigonometry Page 189

Answer 1

answer to your question if doubts arise write in the comment section

Answer 2

Heya,

Here are the required solutions:-

iii)cos 48° - sin 42°

= cos (90°- 42) – sin 42°

= sin 42° - sin 42°

 = 0

iv.) cosec 31° - sec 59°

= cosec (90° - 59°) – sec 59°

= sec 59° - sec 59°

 = 0