Question

Calculati x:...........
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Answer 1

Notam sin x=t. t>0

2t^2-3t+1=0

delta=9-8=1

t1=(3-1)/4=2/4=1/2

sin x=1/2

x1=pi/6

t2=(3+1)/4=4/4=1

sin x=1

x=pi/2