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(Solved): Verify the following trig identity. Take a picture cos(x+y)cos(xy)=cos2(x)sin2(y) ...
Verify the following trig identity. Take a picture
cos
(
x
+
y
)
cos
(
x
−
y
)
=
cos
2
(
x
)
−
sin
2
(
y
)
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