Let `f (x)=cos(pi/x)` and `D_+={x: f (x) gt0} . Then D_+ contains (a) (2/5,1/2) (b) (1/2,2/3) (...
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Channel: Doubtnut · 2018 · Education
To ask Unlimited Maths doubts download Doubtnut from - https://goo.gl/9WZjCW Let `f (x)=cos(pi/x)` and `D_+={x: f (x) gt0} . Then D_+ contains (a) (2/5,1/2) (b) (1/2,2/3) (c) (2/3,-1/2) (d) (-pi,-1/2)`
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