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What is (1+ - cosec )(1+ + ) equal to?

Options

  1. A1
  2. B2
  3. C3
  4. D4

Correct answer

B. 2

Step-by-step solution

aligned & (1+ - cosec )(1+ + ) & = ( + -1 ) ( + +1 ) aligned aligned & = ( + )^2-1^2 & = ^2 + ^2 +2 -1 aligned = 1+2 -1 =2

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