The sine and cosine functions are defined for:
AAll rational numbers
BAll natural numbers
CAll negative numbers
DAll real numbers
Answer & Solution
Correct answer: D. All real numbers
1. No value of x is excluded for them.
2. That is not true of cosec or sec.
3. They are defined for all real numbers.
_Source: NCERT Class 11 Mathematics, Ch 3 'Trigonometric Functions'_
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