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  1. If sinC + sinD = x, then the value of x is
    1. 2 sin
      C + D
      		sin
      C − D
      22
    2. 2 sin
      C − D
      		cos
      C + D
      22
    3. 2 cos
      C + D
      		cos
      C − D
      22
    4. 2 sin
      C + D
      		cos
      C − D
      22
Correct Option: D

Here, sinC + sinD = x
⇒ x = sinC + sinD

⇒ x = 2.sin
C + D
 .cos
C - D
22

[∵ it is the basic formula of sinC + sinD]


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