(vii)
The value of sin (tan-'x + tan-'1/x),x>0 is
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Answered by
1
Step-by-step explanation:
Given that sin
−1
(1−x)−2sin
−1
x=
2
π
let x=siny
∴sin
−1
(1−siny)−2y=
2
π
⇒sin
−1
(1−siny)=
2
π
+2y
⇒1−siny=sin(
2
π
+2y)
⇒1−siny=cos2y
⇒1−siny=1−2sin
2
y as cos2y=1−2sin
2
y
⇒2sin
2
y−siny=0
⇒2x
2
−x=0
⇒x(2x−1)=0
⇒x=0,2x−1=0
⇒x=0,2x=1
⇒x=0,x=
2
1
But x=
2
1
does not satisfy the given equation
∴x=0 is the solution of the given equation.
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