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  1. If cosC – cosD = y, then the value of y is
    1. 2sin
      C + D
      		.sin
      C - D
      22
    2. 2cos
      C + D
      		.cos
      C - D
      22
    3. - 2sin
      C + D
      		.sin
      C - D
      22
    4. - 2cos
      C + D
      		.cos
      C - D
      22
Correct Option: C

Here,
cosC – cosD = y
⇒ y = cosC – cosD
⇒ y = –2sin

C + D
.sin
C - D
22

[∵ It is the basic formula of cosC – cosD]


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