sin(x) + sin(x)cot(x)^2 = sec(x)

Understand the Problem

The question is asking to solve the trigonometric equation sin(x) + sin(x)cot(x)^2 = sec(x). We need to simplify and manipulate the equation using trigonometric identities to find the values of x that satisfy the equation.

Answer

To find solutions for $\sin(x)$, we need to solve a quadratic equation derived from the original trigonometric equation. The specific values would depend on the coefficients obtained in that equation.
Answer for screen readers

The solutions for the given equation can be solved using the quadratic formula derived above. The two possible values for $\sin(x)$ must be calculated based on the coefficients.

Steps to Solve

  1. Rewrite the equation using trigonometric identities
    We start with the equation:
    $$ \sin(x) + \sin(x) \cot^2(x) = \sec(x) $$
    We can use the identity $\cot(x) = \frac{\cos(x)}{\sin(x)}$, hence $\cot^2(x) = \frac{\cos^2(x)}{\sin^2(x)}$.
    Substituting this into the equation gives us:
    $$ \sin(x) + \sin(x) \left(\frac{\cos^2(x)}{\sin^2(x)}\right) = \sec(x) $$

  2. Simplify the equation
    Now, simplify the left side:
    $$ \sin(x) + \frac{\sin(x) \cos^2(x)}{\sin^2(x)} = \sec(x) $$
    That simplifies further to:
    $$ \sin(x) + \frac{\cos^2(x)}{\sin(x)} = \sec(x) $$

  3. Express sec(x) in terms of sine and cosine
    Using the identity $\sec(x) = \frac{1}{\cos(x)}$, we rewrite the equation:
    $$ \sin(x) + \frac{\cos^2(x)}{\sin(x)} = \frac{1}{\cos(x)} $$

  4. Multiply through by $\sin(x) \cos(x)$ to eliminate the fractions
    Multiplying through gives us:
    $$ \sin^2(x) \cos(x) + \cos^2(x) = \sin(x) $$

  5. Rearranging the equation
    We can rearrange it into standard form:
    $$ \sin^2(x) \cos(x) - \sin(x) + \cos^2(x) = 0 $$

  6. Let’s apply a trigonometric identity
    Using $\sin^2(x) + \cos^2(x) = 1$:
    Now, replace $\cos^2(x)$ with $1 - \sin^2(x)$ in the equation:
    $$ \sin^2(x) \cos(x) - \sin(x) + (1 - \sin^2(x)) = 0 $$

  7. Combine like terms
    This simplifies to:
    $$ \sin^2(x) \cos(x) - \sin(x) + 1 - \sin^2(x) = 0 $$
    or
    $$ \sin^2(x)(\cos(x) - 1) - \sin(x) + 1 = 0 $$

  8. Solve the equation for x
    This is a quadratic in terms of $\sin(x)$. Let $y = \sin(x)$:
    $$ y^2 (\cos(x) - 1) - y + 1 = 0 $$

You can use the quadratic formula $y = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$ to find $y$.

The solutions for the given equation can be solved using the quadratic formula derived above. The two possible values for $\sin(x)$ must be calculated based on the coefficients.

More Information

By manipulating the original equation with trigonometric identities, we found a quadratic equation in terms of $\sin(x)$. The roots of this quadratic will give us the values of $x$ at which the original equation holds true.

Tips

  • Misapplying trigonometric identities can lead to incorrect simplifications.
  • Forgetting to consider the domain of the trigonometric functions when finding solutions can result in extraneous solutions.

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