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
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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:
$$ \sin(x) + \sin(x) \left(\frac{\cos^2(x)}{\sin^2(x)}\right) = \sec(x) $$ -
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:
$$ \sin(x) + \frac{\cos^2(x)}{\sin(x)} = \sec(x) $$ -
Express sec(x) in terms of sine and cosine
Using the identity $\sec(x) = \frac{1}{\cos(x)}$, we rewrite the equation:
$$ \sin(x) + \frac{\cos^2(x)}{\sin(x)} = \frac{1}{\cos(x)} $$ -
Multiply through by $\sin(x) \cos(x)$ to eliminate the fractions
Multiplying through gives us:
$$ \sin^2(x) \cos(x) + \cos^2(x) = \sin(x) $$ -
Rearranging the equation
We can rearrange it into standard form:
$$ \sin^2(x) \cos(x) - \sin(x) + \cos^2(x) = 0 $$ -
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:
$$ \sin^2(x) \cos(x) - \sin(x) + (1 - \sin^2(x)) = 0 $$ -
Combine like terms
This simplifies to:
$$ \sin^2(x) \cos(x) - \sin(x) + 1 - \sin^2(x) = 0 $$
or
$$ \sin^2(x)(\cos(x) - 1) - \sin(x) + 1 = 0 $$ -
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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