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AP EAMCET2014MathematicsTrigonometric Ratios & Identities

If x= y, y= z and z= x , then x equals to

Options

  1. A5 +1 4
  2. B5 -1 4
  3. C5 +1 2
  4. D5 -1 2

Correct answer

D. 5 -1 2

Step-by-step solution

Given, x= y, y= z and z= x x= y x= 1 z x= z x= x x= x x ^2 x= x 1- ^2 x= x ^2 x+ x-1=0 aligned x & = -1 1-4 (-1) 2 1 & = -1 5 2 x= 5 -1 2 & ( -1- 5 2 < -1 ) aligned

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