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Sin[θ+(pi/6)] Multiple values???

  • #1
13
10
Question:
If cosθ=(3/5) and 0<θ<2pi
determine the value of sin[θ+(pi/6)]

Attempt:
θ=cos^-1(3/5)

θ=0.927295218

sin[θ+(pi/6)]=0.992820323

real answer = 0.992820323, -0.39282

How do i find the second value, all i can find is 0.992820323 but not -0.39282
 

Answers and Replies

  • #2
DrClaude
Mentor
7,148
3,283
Attempt:
θ=cos^-1(3/5)

θ=0.927295218
This is not the only possibility.
 
  • #3
13
10
thank you i understand now
 

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