$BCD$ is a right-angled triangle where $\angle BCD=90{}^\circ $. $CB$ is produced to \(A\

Question

$BCD$ is a right-angled triangle where $\angle BCD=90{}^\circ $. $CB$ is produced to $A$ and $CD$ is produced to $E$. Given that $\cos \angle BDE=-\frac{21}{29}$, express as a fraction, the value of $\cos \angle BDC$, $\tan \angle DBC$, $\sin \angle DBA$.

Accepted Answer

(i) $\cos\angle BDC=\frac{21}{29}$ (ii) $\tan\angle DBC=\frac{21}{20}$ (iii) $\sin\angle DBA=\frac{21}{29}$

Trigonometric Ratios of Acute and Obtuse Angles

Trigonometric Ratios of Acute and Obtuse Angles

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