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Question

The value of cos space y cos space left parenthesis pi divided by 2 minus x right parenthesis minus cos space left parenthesis pi divided by 2 minus y right parenthesis cos space x plus sin space y cos space left parenthesis pi divided by 2 minus x right parenthesis plus cos space x sin space left parenthesis pi divided by 2 minus y right parenthesis is Zero if

  1. x=0
  2. y=0
  3. x=y
  4. x equals n pi minus pi divided by 4 plus y left parenthesis n element of I right parenthesis

The correct answer is: x equals n pi minus pi divided by 4 plus y left parenthesis n element of I right parenthesis

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