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Mathematics
Mathematics
Problem
19. Using the fact that
sin
(
A
+
B
)
=
sin
A
cos
B
+
cos
A
sin
B
\sin (\mathrm{A}+\mathrm{B})=\sin \mathrm{A} \cos \mathrm{B}+\cos \mathrm{A} \sin \mathrm{B}
sin
(
A
+
B
)
=
sin
A
cos
B
+
cos
A
sin
B
and the differentiation, obtain the sum formula for cosines.
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