My Math Forum  

Go Back   My Math Forum > High School Math Forum > Pre-Calculus

Pre-Calculus Pre-Calculus Math Forum


Reply
 
LinkBack Thread Tools Display Modes
February 27th, 2019, 11:59 AM   #1
Newbie
 
Joined: Feb 2019
From: Seattle, Washington

Posts: 1
Thanks: 0

How do you do these problems?

1. How do you use the composite properties to show that an equation is an identity?With this equation.cos(θ-180) = -cosθ


2. How do you use the composite argument properties to transform the left side of the equation to a single function of a composite argument?
cosxcos50°-sinxsin50°=.7then solve algebraeically with the domain x∈[0°,360°]

4. How do you find the complement angle and the cofunction of that complement of cos241 degrees and show that they equal each other.

5.How do you find the complement angle and cofunction of that complement of csc79 degrees and show how they equal each other.
ccarney is offline  
 
February 28th, 2019, 10:11 AM   #2
Senior Member
 
romsek's Avatar
 
Joined: Sep 2015
From: USA

Posts: 2,408
Thanks: 1310

1) just apply $\cos(a+b) = \cos(a)\cos(b) - \sin(a)\sin(b)$ and evaluate.

2) do (1) in reverse

3) THERE IS NO 3! (re Monty Python Bruce sketch )

4) do you know what complementary angles and cofunctions are? The question is pretty straightforward if you do.

5) same comment as (4)
romsek is offline  
Reply

  My Math Forum > High School Math Forum > Pre-Calculus

Tags
precalculus, problems



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
How to master maths - should we solve simple problems or variety of problems? joshis1 Algebra 2 October 10th, 2014 03:55 PM
please Help me With These Three Problems Bhushan Algebra 2 May 14th, 2013 05:59 PM
2 new problems MATHS FRIEND Algebra 1 August 14th, 2012 03:28 AM
Log problems and word problems help thenewkid77 Algebra 1 March 11th, 2010 06:27 AM
Problems muzzy Advanced Statistics 1 February 24th, 2009 05:05 PM





Copyright © 2019 My Math Forum. All rights reserved.