Introduction to...

If $\sin \theta =\frac{ 5}{13}$ then $\cos \theta =$?

In right triangle $ABC$, right-angled at $C$, if $\tan A = 1$, then the value of $2 \sin A \cos A$ is:

Which of the following is true:

If $\tan \theta =\frac{20}{21}$, then $\frac{\cos \theta -\sin \theta }{\cos \theta +\sin \theta }=$?

If $5 \tan \alpha =4$, then the value of $\frac{5 \sin \alpha -3 \cos \alpha }{5 \sin \alpha +2 \cos \alpha }$ is:

If $\tan \theta =\frac{a}{b}$, then $\frac{\cos \theta +\sin \theta }{\cos \theta -\sin \theta }=$?

If $\tan \theta =\frac{20}{21}$, then $\frac{1-\sin \theta +\cos \theta }{1+\cos \theta +\sin \theta }=$?

If $4 \tan \theta =3$, then $\frac{4 \sin \theta -\cos \theta }{4 \sin \theta +\cos \theta }$ is equal to:

If $cot \theta =\frac{7}{8}$, then the value of $\frac{\left(1+\sin \theta \right)\left(1-\sin \theta \right)}{\left(1+\cos \theta \right)\left(1-\cos \theta \right)}$ is:

If $\sin A + {\sin }^{2}A=1$, then ${\cos }^{2}A+{\cos }^{4}A=$?

The value of the expression $\left[\cos ec\left(75°+\theta \right)-sec\left(15°-\theta \right)-\tan \left(55°+\theta \right)+cot\left(35°-\theta \right)\right]$ is:

In $\Delta ABC$, if $\angle B = 90°$ and $cot A = 1$, then the value of $\cos C \sin A – \cos A \sin C$ is:

If $\cos A=\frac{4}{5}$, then $\tan A=$?

Given that: $\sin A=\frac{a}{b}$, then $\cos A=$?

If $\sin A = \frac{12}{13}$, then $\tan A =$?