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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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 #1
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cos (theta)  = x / r =  a / sqrt [ a^2 + b^2]

 

 

 

cool cool cool

CPhill  Mar 3, 2017

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