The Reason 1, Reason 2, and Reason 3 are Addition, Sine Sum Identity, and Simplify.
What is trigonometry?
Trigonometry is a branch of mathematics that deals with the relationship between sides and angles of a right-angle triangle.
The question is incomplete.
The complete question is in the picture, please refer to the attached picture.
We have:
= sin2x (given)
= sin(x + x) (sine sum property)
= sinx cosx + cosx sinx
= 2sinx cosx
Thus, the Reason 1, Reason 2, and Reason 3 are Addition, Sine Sum Identity, and Simplify.
Learn more about trigonometry here:
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