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AP EAMCET2005MathematicsTrigonometric Equations

If -4 =1 , then +4 is equal to

Options

  1. A1
  2. B0
  3. C2
  4. D4

Correct answer

D. 4

Step-by-step solution

On squaring both sides of equation (i) array rlrl & ^2 +16 ^2 -8 & =1 & & 15 ^2 -8 & =0 & & (15 -8 ) & =0 & & =0 or & = 8 15 array but is not satisfy the equation (i) aligned & =0 & =0, & at & =0 & +4 =0+4=4 & at & = & +4 =0-4=-4 & aligned

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