Find one solution for each equation. Assume all angles involved are acute angles. See Example 3. sec(3β + 10°) = csc(β + 8°)

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Recall the definitions of the secant and cosecant functions in terms of sine and cosine: \(\sec \theta = \frac{1}{\cos \theta}\) and \(\csc \theta = \frac{1}{\sin \theta}\).

Rewrite the given equation \(\sec(3\beta + 10^\circ) = \csc(\beta + 8^\circ)\) using these definitions: \(\frac{1}{\cos(3\beta + 10^\circ)} = \frac{1}{\sin(\beta + 8^\circ)}\).

Cross-multiply to get an equation involving sine and cosine: \(\sin(\beta + 8^\circ) = \cos(3\beta + 10^\circ)\).

Use the co-function identity \(\cos \theta = \sin(90^\circ - \theta)\) to rewrite the right side: \(\sin(\beta + 8^\circ) = \sin(90^\circ - (3\beta + 10^\circ))\).

Simplify the right side inside the sine function and then solve the resulting equation \(\sin A = \sin B\) for \(\beta\), considering that \(\beta\) is an acute angle (between \(0^\circ\) and \(90^\circ\)). Remember that \(\sin A = \sin B\) implies \(A = B + 360^\circ k\) or \(A = 180^\circ - B + 360^\circ k\) for any integer \(k\).

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Reciprocal Trigonometric Functions

Secant (sec) and cosecant (csc) are reciprocal functions of cosine and sine, respectively. Specifically, sec(θ) = 1/cos(θ) and csc(θ) = 1/sin(θ). Understanding these relationships allows rewriting the equation in terms of sine and cosine for easier manipulation.

Solving Trigonometric Equations

Solving trigonometric equations involves isolating the trigonometric function and finding angle values that satisfy the equation within the given domain. Since the problem restricts angles to acute values, solutions must be between 0° and 90°, which limits possible solutions.

Angle Sum and Multiple Angle Arguments

The equation involves expressions like 3β + 10° and β + 8°, which are linear combinations of the variable β. Understanding how to handle these composite angles is essential, as it requires applying algebraic techniques and possibly inverse trigonometric functions to isolate β.