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CBSE XI
>>
Math
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Trigonometric Functions
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Q)
If
x
=
sec
ϕ
−
tan
ϕ
and
y
=
c
o
s
e
c
ϕ
+
cot
ϕ
then show that
x
y
+
x
−
y
+
1
=
0
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