त्रिज्या ‘a’ च्या वर्तुळाचे क्षेत्रफळ खालीलपैकी कोणत्या पूर्णांकाचे अनुसरण करून शोधता येते?

1
\(\mathop \smallint \limits_a^b \left( {{a^2} + {x^2}} \right)dx\)
2
\(\mathop \smallint \limits_0^{2\pi } \sqrt {\left( {{a^2} - {x^2}} \right)} \;dx\)
3
\(4 \times \mathop \smallint \limits_0^a \sqrt {\left( {{a^2} - {x^2}} \right)} \;dx\)
4
\(\mathop \smallint \limits_0^a \sqrt {\left( {{a^2} - {x^2}} \right)} \;dx\)

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