Trigonometrical Ratios of Standard Angles [Including Evaluation of an Expression Involving Trigonometric Ratios] — MATHEMATICS STD 9 — Question
ICSE BoardEnglish MediumSTD 9MATHEMATICSTrigonometrical Ratios of Standard Angles [Including Evaluation of an Expression Involving Trigonometric Ratios]2 Marks
Question
Solve the following equation for $A,$ if $\sqrt{3} \cot 2\ A = 1$
✓
Answer
$\sqrt{3} \cot 2 A =1$
$ \cot 2 A =\frac{1}{\sqrt{3}} $
$\cot 2 A =\cot 60^{\circ} $
$2 A =60^{\circ} $
$A =30^{\circ}$
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