prove sin(40°+A)*cos(20°-A)+cos(40°+A)*sin(20°-A)=√3/2
Answers
Answered by
1
Answer:
Step-by-step explanation:
using the
addition formula for sine
∙
x
sin
(
x
±
y
)
=
sin
x
cos
y
±
cos
x
sin
y
thus the expression on the left side represents
sin
(
20
+
40
)
∘
=
sin
60
∘
=
√
3
2
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0
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