AQA A Level Maths: Pure复习笔记5.5.1 Reciprocal Trig Functions - Definitions

Reciprocal Trig Functions - Definitions

What are the reciprocal trigonometric functions?

  • There are three reciprocal trig functions corresponding to the three regular trig functions

5.5.1-Recip-Trig-Functs-Defs

  • Cotangent can also be written in terms of sine and cosine

5.5.1-Recip-Trig-Functs-Cotan

Exam Tip

  • To solve equations with the reciprocal trig functions, convert them into the regular trig functions and solve in the usual way.
  • Don't forget that both tan and cot can be written in terms of sin and cos (see the Worked Example below).
  • You will sometimes see csc instead of cosec for cosecant.

Worked Example

5.5.1-Recip-Trig-Functs-Example

 

 

 

 

 

 

 

转载自savemyexams

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