Asked by josh
If sin(θ) = 8/17 and θ terminates in QI, find cos(θ)
Answers
Answered by
Reiny
sinØ = 8/17
y = 8, r = 17
x^2 + 8^2 = 17^2
x^2 = 225
x = ± 15 , but we are told Ø is in quad I
so x = 15
cosØ = x/r = 15/17
y = 8, r = 17
x^2 + 8^2 = 17^2
x^2 = 225
x = ± 15 , but we are told Ø is in quad I
so x = 15
cosØ = x/r = 15/17
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