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COMEDK2022MathematicsTrigonometric Ratios & Identities

What is 1- + 1- equal to?

Options

  1. A-
  2. B2
  3. C+
  4. D2

Correct answer

C. +

Step-by-step solution

The given expression is E = 1 - + 1 - . Substituting = and = , we get: E = 1 - + 1 - E = - + - E = ^2 - + ^2 - Since - = -( - ) , we have: E = ^2 - - ^2 - E = ^2 - ^2 - Using the identity a^2 - b^2 = (a - b)(a + b) , we get: E = ( - )( + ) - E = + Answer: +

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