Question

Urgent!!!!!!
Sa se arate ca :
a)$\frac{tg.15 grade+ctg.15 grade}{cos.15grade-sin.15grade} = 4\sqrt{2}$
b)$\frac{1}{ cos^{2}15 grade } + \frac{1}{ sin^{2} 15 grade } =16$

Answer 1

...................................