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The minimum value of y=5x^(2)-2x+1 is...

The minimum value of `y=5x^(2)-2x+1` is

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(i) `sin 1^(@)=sin(1^(@)xxpi/180^(@))=sin pi/180~~pi/180`
(ii) `tan 2^(@)=tan(2^(@)xxpi/180^(@))=tan pi/90~~pi/90`
(iii) `cos 1^(@)=cos(1^(@)xxpi/180^(@))=cos pi/180=1`
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