Question 978297
I have cos=4/5,  tan is smaller than 0.
What is sin, cos, tan, csc, sec, cot?
I found cos=4/5 and sec 5/4.
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cos + and tan negative --> Q4
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|sin| = sqrt(1 - cos^2) = 3/5
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sine neg in Q4 --> -3/5
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tan = sin/cos = -3/4
cot = 1/tan
csc = 1/sin