YOU SAID:

I'm in trigonometry and it's so boring

INTO JAPANESE

私は三角法をしています、そしてそれはとても退屈です

BACK INTO ENGLISH

I am doing trigonometry, and that is very boring

INTO JAPANESE

私は三角法をやっています、そしてそれは非常に退屈です

BACK INTO ENGLISH

I am doing trigonometry, and that is very boring