40. The range of f(x)=cos x - sinx ...
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40. The range of f(x)=cos x - sinx is (a) (-1,1) (b) (-1,1) (©)[-2, ] d) [-v2,v2]

JEE/Engineering Exams
Maths
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At ( x=135^{circ} cdot f(x)=-sqrt{2} ) So, range ( =[-sqrt{2}, sqrt{2}] ) ans At ( x=315 text { fex })=sqrt{2} )
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