SOLUTION: Use the given information to evaluate each expression. (Enter your answers in exact form.)
cos β = −2/7 with 180° < β < 270°
(a) sin(β/2) =
(b) cos(β
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Question 975681: Use the given information to evaluate each expression. (Enter your answers in exact form.)
cos β = −2/7 with 180° < β < 270°
(a) sin(β/2) =
(b) cos(β/2) =
(c) tan(β/2) =
Answer by ikleyn(52799) (Show Source): You can put this solution on YOUR website!
Use the formulas for trigonometric functions of half argument (see, for example, the lesson FORMULAS FOR TRIGONOMETRIC FUNCTIONS in this site)
= = = = = = = = .
= = = = = = = =
(the sign "minus" because the angle is in the 2-nd quadrant).
= = = .
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