Trigonometric Ratios and Identities

Section: Mathematics

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Question : 45 of 64

Marks: +1, -0

If x=

∞

∑

n=0

(−1)ntan2nθ and y=

∞

∑

n=0

cos2nθ, for 0<θ<

π

4

, then :

[9 Jan 2020 Shift 2]

y(1+x)=1
x(1+y)=1
y(1−x)=1
x(1−y)=1

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