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JEE Main 2024
Trigonometry
Trigonometric Ratio and Identites
Easy

Question

If tan15+1tan75+1tan105+tan195=2a\tan 15^\circ + {1 \over {\tan 75^\circ }} + {1 \over {\tan 105^\circ }} + \tan 195^\circ = 2a, then the value of (a+1a)\left( {a + {1 \over a}} \right) is :

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Solution

tan15+tan15tan15+tan15\tan 15^\circ + \tan 15^\circ - \tan 15^\circ + \tan 15^\circ =2tan15= 2\tan 15^\circ =2(23)=2aa=23= 2\left( {2 - \sqrt 3 } \right) = 2a \Rightarrow a = 2 - \sqrt 3 \therefore 1a+a(2+3)+(23)=4{1 \over a} + a \Rightarrow \left( {2 + \sqrt 3 } \right) + \left( {2 - \sqrt 3 } \right) = 4

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