I need help with this trig expression writing it as an algebraic expression: sin(arcsin x + arcos x)
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Originally Posted by adam456006 I need help with this trig expression writing it as an algebraic expression: sin(arcsin x + arcos x) Let $\displaystyle \alpha = \arcsin x \Rightarrow \sin \alpha = x$ and $\displaystyle \beta = \arccos x \Rightarrow \sin \beta = x$ and note that $\displaystyle \sin (\alpha + \beta) = \sin \alpha \cos \beta + \sin \beta \cos \alpha $.
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