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 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.
 February 28th, 2019, 10:11 AM #2 Senior Member     Joined: Sep 2015 From: USA Posts: 2,590 Thanks: 1434 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)

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