The set of the steps used to prove the sine sum identity are use the complementary relationship between sine and cosine to rewrite sin(x + y) as Cosine (Start Fraction pi over 2 End Fraction minus (x + y) ). Apply the cosine sum identity. Then simplify, using sin( –y ) = –sin(y) and cos(–y) = cos(y).
<h3>What is trigonometry?</h3>
Trigonometry is the study of side, length and angles of the triangle. There are some formulas to solve trigonometry which we have to memorize.
