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Given that tan x = \(\frac{2}{3}\), where 0o d" x d" 90o, Find the value...

Mathematics
JAMB 2015

Given that tan x = \(\frac{2}{3}\), where 0o d" x d" 90o, Find the value of 2sinx.
  • A. \(\frac{2\sqrt{13}}{13}\)
  • B. \(\frac{3\sqrt{13}}{13}\)
  • C. \(\frac{4\sqrt{13}}{13}\)
  • D. \(\frac{6\sqrt{13}}{13}\)
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Correct Answer: Option C
Explanation
tan x = \(\frac{2}{3}\)(given), is illustrated in a right-angled \(\Delta\)

thus m2 = 22 + 32

= 4 + 9 = 13

m = \(\sqrt{13}\)

Hence, 2sin x = 2 x \(\frac{2}{m}\)

2 x\(\frac{2}{\sqrt{13}}\)

= \(\frac{4}{\sqrt{13}}\)

= \(\frac{4}{\sqrt{13}} = \frac{\sqrt{13}}{\sqrt{13}}\)

= \(\frac{4\sqrt{13}}{13}\)

There is an explanation video available below.


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Explanation Video

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