which one is not periodic 527002388

Releted Question 1

If $$\tan \theta = - \frac{4}{3},$$ then $$\sin \theta $$ is

A. $$ - \frac{4}{5}{\text{ but not }}\frac{4}{5}$$

B. $$ - \frac{4}{5}{\text{ or }}\frac{4}{5}$$

C. $$ \frac{4}{5}{\text{ but not }} - \frac{4}{5}$$

D. None of these

Releted Question 2

A. $$\tan \frac{\alpha }{2} + \tan \frac{ \beta }{2} + \tan \frac{\gamma }{2} = \tan \frac{\alpha }{2}\tan \frac{\beta }{2}\tan \frac{\gamma }{2}$$

B. $$\tan \frac{\alpha }{2}\tan \frac{\beta }{2} + \tan \frac{\beta }{2}\tan \frac{\gamma }{2} + \tan \frac{\gamma }{2}\tan \frac{\alpha }{2} = 1$$

C. $$\tan \frac{\alpha }{2} + \tan \frac{ \beta }{2} + \tan \frac{\gamma }{2} = - \tan \frac{\alpha }{2}\tan \frac{\beta }{2}\tan \frac{\gamma }{2}$$

D. None of these

Releted Question 3

A. $$1 \leqslant A \leqslant 2$$

B. $$\frac{3}{4} \leqslant A \leqslant 1$$

C. $$\frac{13}{16} \leqslant A \leqslant 1$$

D. $$\frac{3}{4} \leqslant A \leqslant \frac{{13}}{{16}}$$

Releted Question 4

A. 2

B. $$\frac{{2\sin {{20}^ \circ }}}{{\sin {{40}^ \circ }}}$$

C. 4

D. $$\frac{{4\sin {{20}^ \circ }}}{{\sin {{40}^ \circ }}}$$