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3.Trigonometrical Ratios, Functions and Identities
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The value of $cot\, 7\frac{{{1^0}}}{2}$ $+ tan\, 67 \frac{{{1^0}}}{2} - cot 67 \frac{{{1^0}}}{2} - tan7 \frac{{{1^0}}}{2}$ is :
A
a rational number
B
irrational number
C
$2(3 + 2 \sqrt 3)$
D
$2 (3 -\sqrt 3)$
Solution
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Standard 11
Mathematics