prove that cos x/1+sin x=cot (x/2)-1/cot(x/2)+1
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Answer:
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Step-by-step explanation:
RHS
=
1
+
cos
x
sin
x
=
2
cos
2
(
x
2
)
2
sin
(
x
2
)
cos
(
x
2
)
=
cot
(
x
2
)
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