हल करें
(i) `cos theta =(1)/(2) " " (ii) sin theta=-1`
(iii) `3 tan^(2)theta=1 " " (iv) 2 sin theta =sqrt(3)`
(iv) `sin=x-(sqrt(3))/(2)`

Answer

`(i) 2n pi pm (pi)/(3), n in I " " (ii) n pi+(-1)^(n+1)(pi)/(2)n in I`
(iii) ` n +- (pi)/(6)n in I " " (iv) n pi +(-1)^(n)(pi)/(3)n in I`
(v) `x=xn pi(-1)^(n)(4pi)/(3), n in Z`