यदि x = et cost और y = esint है, तो t = 0 पर  किसके बराबर है?

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NDA 01/2025: English Subject Test
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अवधारणा:

प्राचलिक अवकलन:

यदि x = f(t), y = g(t), जहाँ t एक पैरामीटर है, तो

गणना:

दिया गया है कि: x = et cost और y = esint

आइए सबसे पहले dx/dt का पता लगाएं

अब आइए dy/dt का पता लगाएं

अत: सही विकल्प 2 है।

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