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# I need some help

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The point (a,b) is the point on the unit circle that corresponds to the angle t. Which of the following is the simplest expression that is equal to cos(t)?

•  $$\frac{b}{a+b}$$

• $$\frac{a}{\sqrt{a^2+b^2}}$$

• $$\frac{b}{\sqrt{a^2+b^2}}$$

• a
• none of these
• b
Deathstroke_rule  Mar 3, 2017
edited by Deathstroke_rule  Mar 3, 2017
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cos (theta)  = x / r =  a / sqrt [ a^2 + b^2]

CPhill  Mar 3, 2017