How do I know what it is supposed to be? Please explain. Thank you!
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sketch a reference triangle ... adjacent side = a opposite side = b hypotenuse = ? cosine is the ratio = $\dfrac{\text{? side}}{\text{? side}}$
Cosine is the ration of adjacent/hypotenuse. Does that then make the answer c. a/sqrt a^2 + b^2?
Originally Posted by realbrandon Cosine is the ratio of adjacent/hypotenuse. Does that then make the answer c. a/sqrt(a^2 + b^2)? fixed ...
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