Choose the correct answer
The number of solutions of the equation
is
We need to find the number of solutions of the equation,
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We shall apply the property of inverse trigonometry, that is,
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So,
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Taking tangent on both sides of the equation,
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Using property of inverse trigonometry,
tan(tan-1 A) = A
Also,
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We get,
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Simplifying it,
⇒ 5x = 1 – 6x2
⇒ 6x2 + 5x – 1 =0
Since, this is a quadratic equation, it is clear that it will have 2 solutions.
Let us check:
We have,
6x2 + 5x – 1 = 0
⇒ 6x2 + 6x – x – 1 = 0
⇒ 6x(x + 1) – (x + 1) = 0
⇒ (6x – 1)(x + 1) = 0
⇒ (6x – 1) = 0 or (x + 1) = 0
⇒ 6x = 1 or x = -1
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Hence, there are 2 solutions of the given equation.