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4.2: Trig Proofs

Difficulty Level: At Grade Created by: CK-12
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This activity is intended to supplement Trigonometry, Chapter 3, Lesson 2.

Problem 1 – Using the Calculator for verification

1. Prove: (1+cosx)(1cosx)=sin2x.

Verify the proof graphically. Enter the left side of the equation in Y1 and the right side of the equation in Y2.

Problem 2 - Confirm your findings

For questions 2 through 5, prove the equation given and then verify it graphically. For cotx, type (1tanx). For secx, type (1cosx).

2. sinxcotxsecx=1

3. sec2x1sec2x=sin2x

4. tanx+cotx=secx(cscx)

5. sin2x49sin2x+14sinx+49=sinx7sinx+7

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Date Created:
Feb 23, 2012
Last Modified:
Nov 04, 2014
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