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Dimas [21]
2 years ago
11

Trigonometry help me ​

Mathematics
1 answer:
attashe74 [19]2 years ago
7 0

Answer:

\theta = \frac{\pi}{6}

Step-by-step explanation:

tan^ 2 \theta - ( \sqrt 3 + \frac{1}{\sqrt3}}) tan \theta + 1 = 0\\\\tan \theta - ( \sqrt 3 + \frac{1}{\sqrt3}})  +\frac{1}{ tan \theta } = 0\\\\          [ \ divide \  by \ tan \theta \  on \  both \ sides \ ]

tan\theta + \frac{1}{ tan \theta }- ( \sqrt 3 + \frac{1}{\sqrt3}}) =  0\\\\\frac{tan^2 \theta + 1}{ tan \theta } - ( \sqrt 3 + \frac{1}{\sqrt3}}) =  0\\\\\frac{sec ^2 \theta}{ \frac{sin \theta }{cos \theta}} - ( \sqrt 3 + \frac{1}{\sqrt3}}) =  0              [ \tan ^ 2\theta  + 1 = sec ^2 \theta \ , \ tan \theta = \frac{sin \theta }{cos \theta } \ ]

\frac{sec^2 \theta }{sin \theta \times sec \theta } - ( \sqrt 3 + \frac{1}{\sqrt3}}) =  0\\\\                  [\ \frac{sin \theta }{cos \theta } = sin \theta \times sec \theta \ ]

\frac{sec \theta }{sin \theta } - ( \sqrt 3 + \frac{1}{\sqrt3}}) =  0\\\\

sec \theta \ cosec \theta  - ( \sqrt 3 + \frac{1}{\sqrt3}}) =  0\\\\              [ \ \frac{1}{sin \theta } = cosec \theta \ , \ \frac{ sec \theta }{sin \theta } = sec \theta cosec \theta \ ]

sec \theta \ cosec \theta  - \sqrt 3 - \frac{1}{\sqrt3}} =  0\\\\\frac{\sqrt 3\ sec \theta \ cosec \theta  - 3 - 1}{\sqrt3} =  0\\\\\sqrt 3 sec \theta cosec \theta  - 4 = 0\\\\              

\sqrt3 \frac{1}{cos \theta } \frac{1}{sin \theta } - 4 = 0\\\\\frac{\sqrt3 - 4sin \theta cos \theta} { sin \theta cos \theta } = 0                      

\sqrt 3 - 2sin 2\theta = 0                                  [ \ sin 2 \theta = 2 sin \theta cos \theta \ ]

2sin 2 \theta = \sqrt3\\\\sin 2 \theta = \frac{\sqrt3 }{2} \\\\2 \theta = sin^{-1} (\frac{\sqrt3}{2})\\\\2 \theta = 60^{ \circ} = \frac{ \pi}{3}\\\\\theta = \frac{\pi} {6}

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