Question

1)tg 3п/8 * tg п/8 +1

Answer 1

$tg \frac{3 \pi }{8} tg\frac{\pi }{8} +1=tg(\frac{ \pi }{2} -\frac{ \pi }{8} )tg\frac{ \pi }{8} +1=ctg\frac{ \pi }{8} tg\frac{ \pi }{8} +1=1+1=2$