Mark the tick against the correct answer in the following:
To find: Value of 
Formula used: (i) 
We have, 
On expanding the above,
⇒ (sin 23°) (cos 7°) – (cos 23°) (-sin 7°)
⇒ (sin 23°) (cos 7°) + (cos 23°) (sin 7°)
On applying formula 
= sin (23 + 7)
= sin (30°)
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