4-1.Complex numbers
medium

समीकरण ${a^2} - 2a\sin x + 1 = 0$ को सन्तुष्ट करने वाले $a$ के मानों की संख्या है

A

$0$

B

$1$

C

$2$

D

अनन्त

Solution

(c)दिया गया समीकरण   ${a^2} – 2a\sin x + 1 = 0$ है

$\therefore $ $a = \frac{{2\sin x \pm \sqrt {4{{\sin }^2}x – 4} }}{2}$ 

$ = \sin x \pm \sqrt { – (1 – {{\sin }^2}x)} $
$a = \sin x \pm i\cos x$
यदि $x = \frac{\pi }{2}$==> $a = 1,$$x = {270^o}$==> $a = – 1$.

Standard 11
Mathematics

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