Please help?

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1 Answer
Aviv S.
Mar 7, 2018

The answer is #"A: " pi/2, (5pi)/2#

Explanation:

Isolate #sintheta# and then solve for the only value when #sintheta# is #1#:

#5sintheta-4=2sintheta-1#

#3sintheta-4=-1#

#3sintheta=3#

#sintheta=1#

#theta=pi/2, (5pi)/2#

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