F(x) = x^2 - 5x+8, g(x) = x^2-4
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So.. checking the picture below
we can say y = y, or just do a substitution and end up with
once you know, how long is "x", then you can simply use the cosine of 72° to get "r"
thus
we can say y = y, or just do a substitution and end up with
once you know, how long is "x", then you can simply use the cosine of 72° to get "r"
thus