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Byju's Answer
Standard X
Mathematics
Standard Values of Trigonometric Ratios
If y=cosθ+i s...
Question
If y=cos
θ
+isin
θ
, then the value of y+
1
y
A
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B
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C
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D
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Solution
The correct option is
A
y=cos
θ
+isin
θ
=
e
i
θ
, then
1
y
=
e
−
i
θ
=cos
θ
-isin
θ
∴
y+
1
y
=2cos
θ