If \(4 \cos x+3 \sin x=5\), then find the value of \(\tan x=\)

If \(4 \cos x+3 \sin x=5\), then find the value of \(\tan x=\)
  1. \(\frac{3}{4}\)
  2. \(\frac{4}{3}\)
  3. \(\frac{-3}{4}\)
  4. \(\frac{-4}{3}\)

Solution

Given, \(4 \cos x+3 \sin x=5\) \(\Rightarrow \quad 4+3 \tan x=5 \sec x\) On squaring both sides, we get \(\begin{array}{rlrl} & 16+9 \tan ^2 x+24 \tan x & =25 \sec ^2 x \\ \Rightarrow \quad & 16 \tan ^2 x-24 \tan x+9 & =0 \\ \Rightarrow \quad(4 \tan x-3)^2=0 \Rightarrow \tan x & =\frac{3}{4} \end{array}\)

Asked in: AP EAMCET 2020 (18 Sep Shift 1)

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