Precalculus Archive: Questions from July 28, 2023
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Trig formulas: a² =b² + c²-2bc cos A b² = a² + c² - 2accos B c²=a² + b² - 2ab cosC sin A a sin B b sin C с
Trig formulas: \[ \begin{array}{l} a^{2}=b^{2}+c^{2}-2 b c \cos A \\ b^{2}=a^{2}+c^{2}-2 a c \cos B \\ c^{2}=a^{2}+b^{2}-2 a b \cos C \end{array} \] \[ \frac{\sin A}{a}=\frac{\sin B}{b}=\frac{\sin C}{0 answers -
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1+ sec9 tan 9+ sin 9 = csc 9
\( \frac{1+\sec \vartheta}{\tan \vartheta+\sin \vartheta}=\csc \vartheta \)2 answers -
(tan 9 - sec 9)² = 1-sin 9 1+ sin 9
\( (\tan \vartheta-\sec \vartheta)^{2}=\frac{1-\sin \vartheta}{1+\sin \vartheta} \)0 answers -
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