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I. Express the LHS in terms of sine and cosine and simplify
Start from the LHS (left-hand side)
Learn how to solve trigonometric identities problems step by step online.
Learn how to solve trigonometric identities problems step by step online. Prove the trigonometric identity cos(x+-pi/2)=sin(x). section:I. Express the LHS in terms of sine and cosine and simplify. Start from the LHS (left-hand side). Using the cosine of a sum formula: \cos(\alpha\pm\beta)=\cos(\alpha)\cos(\beta)\mp\sin(\alpha)\sin(\beta), where angle \alpha equals x, and angle \beta equals -\frac{\pi}{2}. The sine of -\frac{\pi}{2} equals .