Q2 of 54 Page 312

Without using trigonometric tables, prove that:
cosec 80° - sec 10° = 0

Consider cosec 80° - sec 10° = cosec 80° - sec (90 - 10)°

= cosec 80° - cosec 80°


= 0


Hence, proved.


More from this chapter

All 54 →
2

Without using trigonometric tables, prove that:

cos 81° - sin 9° = 0

 2

Without using trigonometric tables, prove that:
tan 71° - cot 19° = 0

 2

Without using trigonometric tables, prove that:
cosec2 72° - tan2 18° = 1

 2

Without using trigonometric tables, prove that:
cos275° + cos215° =1