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AP EAMCET2012MathematicsTrigonometric Ratios & Identities

36^ - 72^ is equal to

Options

  1. A1
  2. B1 2
  3. C1 4
  4. D1 8

Correct answer

B. 1 2

Step-by-step solution

36^ - 72^ =-2 ( 36^ +72^ 2 ) ( 72^ -36^ 2 ) aligned & =-2 54^ (-18^ ) & =2 54^ 18^ & =2 5 +1 4 5 -1 4 =2 5-1 4 4 = 4 8 & = 1 2 aligned

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