Let x denotes the greatest integer less than or equal to x. Then fx=1+sincosxcossinx is

TS EAMCET · Maths · Continuity and Differentiability

Let $[x]$ denotes the greatest integer less than or equal to $x$ . Then $f (x) = \frac{1 + \sin ([\cos x])}{\cos ([\sin x])}$ is

A continuous on $(0, \frac{π}{2})$
B continuous on $(0, π)$
C discontinuous on $(π, \frac{3 π}{2})$
D continuous on $(π, 2 π)$

Verified Solution

Answer & Solution

Correct Answer

(A) continuous on $(0, \frac{π}{2})$

Step-by-step Solution

Detailed explanation

fx=1+sin([cosx])cos([sinx]) For interval 0,π2 [cosx]=0 [sinx]=0 So, fx=1+sin(0)cos(0) f(x)=1 So, f(x) is continuous in 0,π2

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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