Teaching DSSSB TGT Mock Test 2025 Engineering Mathematics Calculus Vector Calculus

यदि इकाई सदिश \(\vec b = \alpha \hat i + \beta \hat j\) के अनुदिश (2, -1) पर फलन z = y2e2x का दिशात्मक अवकलज शून्य है तो |α + β| किसके बराबर है?

1
\(\frac{1}{{2\sqrt 2 }}\)
2
\(\frac{1}{{\sqrt 2 }}\)
3
√2
4
2√2
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