Question

sin 39°× cos 21° + sin 21° cos 39°​

Answer 1

Answer:

always ask the question you don't know the answer where are you doing

Answer 2

= sin (39° + 21° )

= sin 60°

= √3 / 2

Step-by-step explanation:

sin (A+B ) = sin AcosB+cosAsinB

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