মূলবিন্দু হতে $x s e c θ - y \cos e c θ = k$ এবং $x c o x θ - y \sin θ = k \cos 2 θ$ রেখাদ্বয়ের লম্ব দূরত্ব যথাক্রমে 2cm এবং 3cm । k এর মান নির্ণয় কর।

Created: 1 year ago | Updated: 1 year ago

Updated: 1 year ago

$\frac{k}{\sqrt{s e c^{2} θ + \cos e c^{2} θ}} = 2 \Rightarrow \frac{k^{2}}{\frac{1}{\cos^{2} θ} + \frac{1}{\sin^{2} θ}} = 4$

$\Rightarrow \frac{k^{2} \sin^{2} \cos^{2} θ}{\sin^{2} θ + \cos^{2} θ} = 4$

$\Rightarrow 4 k^{2} \sin^{2} θ \cos^{2} θ = 16 \Rightarrow {(k \sin 2 θ)}^{2} = 4^{2} . . . . . . . . . (i)$

$|\frac{- k \cos 2 θ}{\sqrt{\cos^{2} θ + \sin^{2} θ}}| = 3 \Rightarrow {(k \cos 2 θ)}^{2} = 3^{2} . . . . . . . . . (i i)$

(i) + (ii) করে পাই, $k^{2} (\sin^{2} 2 θ + \cos^{2} 2 θ) = 25 \Rightarrow k = \pm 5$

1 year ago

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