Pre-Calc grade 12 advanced function Trig

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1. Determine approximate solutions for each
equation in the interval x ∈ [0, 2π], to the
nearest hundredth of a radian.
a) sinx - 1/4 = 0



3. I don't know what to do... I am supposed to asnwer in radian like this --> (π/4 , 4π/6 etc..)
 
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