Question

if 2 costhetha -sin thetha =x and cos thetha - 3 sin thetha = y prove that 2 x^2+y^2-2xy=5


please solve please....☃​

Answer 1

Step-by-step explanation:

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$\red{\bold{\underline{\underline{QUESTION:-}}}}$

Q:-solve and verify the equation

$\frac{1}{3} x - 4 = x - ( \frac{1}{2} + \frac{x}{ 3} )$

$\huge\tt\underline\blue{Answer }$

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$⟹</p><p> \frac{1}{3} x - 4 = x - ( \frac{1}{2} + \frac{x}{3} )$

$⟹</p><p> \frac{x}{3} - 4 = x - ( \frac{3 + 2x}{6} )$

$⟹</p><p> \frac{x - 12}{3} = x - ( \frac{2x + 3}{6} )$

$⟹</p><p> \frac{x - 12}{3} = x - \frac{2x - 3}{6}$

$⟹</p><p> \frac{x - 12}{3} = \frac{6x - 2x - 3}{6}$

$⟹</p><p> \frac{x - 12}{3} = \frac{4x - 3}{6}$

cancelling 6( R.H.S) By 3 From L.H.S

$⟹ \frac{x - 12}{1} = \frac{4x - 3}{2} </p><p>$

$⟹</p><p>2(x - 12) = 4x - 3$

$⟹</p><p>2x - 24 = 4x - 3$

$⟹</p><p> - 24 + 3 = 4x - 2x$

$⟹</p><p> - 21 = 2x$

$⟹</p><p>x = - \frac{21}{2}$

CHECK:-

$⟹ \frac{ - \frac{21}{2} }{3} - 4 = - \frac{21}{2} - ( \frac{1}{2} + ( - ) \frac{ \frac{21}{2} }{3} )</p><p>$

$⟹</p><p> - \frac{21}{6} - 4 = - \frac{21}{2} - ( \frac{1}{2} - \frac{21}{6} )$

$⟹</p><p> - \frac{7}{2} - 4 = - \frac{21}{2} - ( \frac{1}{2} - \frac{7}{2} )$

$⟹</p><p> \frac{ - 7 - 8}{2} = - \frac{21}{2} - ( - \frac{6}{2} )$

$⟹ - \frac{15}{2} = - \frac{21}{2} - ( - 3) </p><p>$

$⟹</p><p> - \frac{15}{2} = - \frac{21}{2} + 3$

$⟹</p><p> - \frac{15}{2} = \frac{ - 21 + 6}{2} = - \frac{15}{2}$

THEREFORE,L.H.S=R.H.S

VERIFIED✔️

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HOPE IT HELPS YOU..

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Answer 2

</p><p>31x−4=x−(21+3x)

⟹ < /p > < p > \frac{x}{3} - 4 = x - ( \frac{3 + 2x}{6} )⟹</p><p>3x−4=x−(63+2x)

⟹ < /p > < p > \frac{x - 12}{3} = x - ( \frac{2x + 3}{6} )⟹</p><p>3x−12=x−(62x+3)

⟹ < /p > < p > \frac{x - 12}{3} = x - \frac{2x - 3}{6}⟹</p><p>3x−12=x−62x−3

⟹ < /p > < p > \frac{x - 12}{3} = \frac{6x - 2x - 3}{6}⟹</p><p>3x−12=66x−2x−3

⟹ < /p > < p > \frac{x - 12}{3} = \frac{4x - 3}{6}⟹</p><p>3x−12=64x−3

cancelling 6( R.H.S) By 3 From L.H.S

⟹ \frac{x - 12}{1} = \{4x - 3}{2} < /p > < p >⟹1x−12=24x−3</p><p>

⟹ < /p > < p > 2(x - 12) = 4x - 3⟹</p><p>2(x−12)=4x−3

⟹ < /p > < p > 2x - 24 = 4x - 3⟹</p><p>2x−24=4x−3

⟹ < /p > < p > - 24 + 3 = 4x - 2x⟹</p><p>−24+3=4x−2x

⟹ < /p > < p > - 21 = 2x⟹</p><p>−21=2x

⟹ < /p > < p > x = - \{21}{2}⟹</p><p>x=−221