\( \sin x - \cos x = 1 \quad | \cdot \frac { \sqrt { 2 } } { 2 } \)
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Bonus Knowledge
Let's explore the equation \( \sin x - \cos x = 1 \) and see what we can do. First, add \( \cos x \) to both sides to get \( \sin x = \cos x + 1 \). Next, we can square both sides to simplify our trigonometric expression, leading to \( \sin^2 x = (\cos x + 1)^2 \). When you apply the Pythagorean identity \( \sin^2 x + \cos^2 x = 1 \), you get a quadratic in terms of \( \cos x \). Solving it can provide roots that lead to specific angles for \( x \). And remember, a common mistake here is neglecting to check for extraneous solutions after squaring both sides! Sometimes squaring can introduce new solutions that don't actually work in the original equation, so always plug those back into the starting equation to verify. It's like making sure the cake you just baked is actually fluffy and delicious!