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Q.

In which one of the following intervals the inequality  sinx<cosx<cotx  can hold good?

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a

(7π4,2π)

b

(π4,π2)

c

(0,π4)

d

(3π4,π)

answer is D.

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Detailed Solution

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In the second quadrant,  sinx<cosx  is false, as  sinx  is positive and   cosx  is negative
In the fourth quadrant,  cosx<cotx  is false, as  cosx  is positive and  cotx  is negative
Now,  sinx<cosx  is true in  (0,π4)   and  cosx<cotx  is also true.
Further,  cosx<cotx, as cotx=cosxsinx and sinx<1
In the interval  (π4,π2)sinx>cosx

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