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Answer: \( \sin \left(x-90^{\circ}\right) \)

Ask by Johnson Savage. in South Africa
Mar 14,2025

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\( \sin\left(x-90^{\circ}\right) = -\cos x \)

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Did you know that the sine function has some nifty properties? When you shift an angle by a specific degree, like subtracting \(90^{\circ}\), it transforms your sine into a cosine! So, \( \sin \left(x - 90^{\circ}\right) \) simplifies to \( -\cos(x) \). This relationship showcases the beauty of trigonometric identities! In practical terms, this is super handy. Take, for example, analyzing sound waves in physics. Using the cosine function instead of sine can sometimes make calculations easier, especially when those angles come into play in wave equations. It’s like having a toolkit of interchangeable tools; the more you know, the easier it gets!

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