Assertion (A): Special functions such as trigonometric, logarithmic and exponential functions ar...

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Assertion (A): Special functions such as trigonometric, logarithmic and exponential functions are not dimensionless.
Reason (R): A pure number, ratio of similar physical quantities, such as angle and refractive index, has no dimensions.
(1) Assertion (A) is true, Reason (R) is true; Reason (R) is a correct explanation for Assertion (A).
(2) Assertion (A) is true, Reason (R) is true; Reason (R) is not a correct explanation for Assertion (A).
(3) Assertion (A) is true, Reason (R) is false.
(4) Assertion (A) is false, Reason (R) is true.
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