📢 Too many exams? Don’t know which one suits you best? Book Your Free Expert 👉 call Now!

  • google app store apple app store
  • ✖

      Question

      Evaluate the following: cos 45° × cos 45° −

      sin 45° × sin 45°
      B 1 Correct Answer Incorrect Answer
      C 1/2 Correct Answer Incorrect Answer
      D 1/√2 Correct Answer Incorrect Answer

      Solution

      We know that, cos (a + b) = cos a × cos b − sin a × sin b So, cos 45° × cos 45° − sin 45° × sin 45°
      = cos (45° + 45°)
      = cos 90°
      = 0

      Practice Next

      Relevant for Exams:

      ask-question