Asked by Alexa
Suppose x is an angle in the second quadrant such that cosx=-8/17, what is the value of tan(3x/2)?
Answers
Answered by
Reiny
first get you results to sine and cosine of x
since you are in II, from your diagram,
sinx = 15/17
tanx = -15/8
use the formula for tan(3x) you just found in your other post.
then apply the formula for tan(A/2)
actually that is a nice one:
tan (A/2) = (1 - cosA)/sinA
good luck
since you are in II, from your diagram,
sinx = 15/17
tanx = -15/8
use the formula for tan(3x) you just found in your other post.
then apply the formula for tan(A/2)
actually that is a nice one:
tan (A/2) = (1 - cosA)/sinA
good luck
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