SOLUTION: Solve for B; cos(3B - pi/4) =1/2

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Question 816603: Solve for B; cos(3B - pi/4) =1/2
Answer by lwsshak3(11628) About Me  (Show Source):
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Solve for B; cos(3B - pi/4) =1/2
assume(3B-π/4) is an acute angle
cos(3B-π/4)=1/2=cos(π/3)
3B-π/4=π/3
3B=π/3+π/4=4π/12+3π/12=7π/12
3B=7π/12
B=7π/36