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    Maths-
    General
    Easy

    Question

    I f cos to the power of 2 end exponent invisible function application A plus cos to the power of 2 end exponent invisible function application B plus cos to the power of 2 end exponent invisible function application C equals 1 comma blank t h e n blank increment A B C blank i s

    1. Equilateral  
    2. Isosceles  
    3. Right angled  
    4. None of these  

    The correct answer is: Right angled

      W e blank h a v e cos to the power of 2 end exponent invisible function application A plus cos to the power of 2 end exponent invisible function application B minus open parentheses 1 minus cos to the power of 2 end exponent invisible function application C close parentheses equals 0 blank
      rightwards double arrow cos to the power of 2 end exponent invisible function application A plus cos to the power of 2 end exponent invisible function application B minus sin to the power of 2 end exponent invisible function application C equals 0
      rightwards double arrow cos to the power of 2 end exponent invisible function application A plus cos invisible function application open parentheses B plus C close parentheses cos invisible function application open parentheses B minus C close parentheses equals 0
      rightwards double arrow 2 cos invisible function application A cos invisible function application B cos invisible function application C equals 0
      Hence, either A blank o r blank B blank o r blank C blank i s blank 90 degree

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