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Question

If $\sqrt{2} \sin(5x - 5)^\circ = \tan 45^\circ$, then the value of x (in degrees) is:

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper PDF (31-Jan-2021) (Shift 1)
The correct answer is
10

Solving Trigonometric Equation

The problem asks for the value of x in degrees, given the equation:

$ \sqrt{2} \sin(5x - 5)^\circ = \tan 45^\circ $

Equation Steps

  1. Evaluate Known Tangent Value: We know that $\tan 45^\circ = 1$. Substituting this into the equation gives:

    $ \sqrt{2} \sin(5x - 5)^\circ = 1 $

  2. Isolate the Sine Function: Divide both sides by $\sqrt{2}$:

    $ \sin(5x - 5)^\circ = \frac{1}{\sqrt{2}} $

  3. Identify the Angle for Sine: Recall that $\sin 45^\circ = \frac{1}{\sqrt{2}}$. Therefore, we can equate the angles:

    $ (5x - 5)^\circ = 45^\circ $

  4. Solve for 5x: Add 5 to both sides of the equation:

    $ 5x^\circ = 45^\circ + 5^\circ $

    $ 5x^\circ = 50^\circ $

  5. Solve for x: Divide both sides by 5:

    $ x = \frac{50^\circ}{5} $

    $ x = 10 $

The value of x is 10 degrees.

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Important Questions from Trigonometric Ratios and Identities

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