Ex 3.3, 8 - Chapter 3 Class 11 Trigonometry - Ex 3.3

  1. Class 11
  2. Important Question for exams Class 11
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Ex 3.3, 8 Prove that cos ( + ) cos ( ) /(sin ( ) cos "( " /2 " + " ")" ) = cot2 Taking L.H.S. ( + ) ( ) /( ( ) "(" /2 " +" ")" ) Putting = 180 = (180 + ) ( ) /( (180 ) "(" 90" + " ")" ) = ( )/((sin ) ( sin ) ) = ( 2 )/( 2 ) = cot2x = R.H.S. Hence proved

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