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If cosx=-0.25, then cos(pi-x)=...

If `cosx=-0.25`, then cos`(pi-x)`=

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If f(x)=sqrt(1-sin2x) , then f^(prime)(x) is equal to (a) -(cosx+sinx) ,for x in (pi/4,pi/2) (b) cosx+sinx ,for x in (0,pi/4) (c) -(cosx+sinx) ,for x in (0,pi/4) (d) cosx-sinx ,for x in (pi/4,pi/2)

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Statement-I: x inQ_(1) and cosx+cos3x=cos2x then x=30^(@)or45^(@) Statement-II: x in(0,2pi) and Cosecx+2=0 then x=(7pi)/(6),(11pi)/(6) Statement-III: x in[0,2pi] and (2cosx-1)(3+2cosx)=0 then x=(pi)/(3),(5pi)/(3) wich of the above statements is correct?