Translation of "Trigonometric" in Japanese

I think that for many people learning the trigonometric functions is meaningless.

多くの人間にとって三角関数を学ぶことは無意味であるように思える。

Er, Sir? What's written on the blackboard isn't an exponential function but a trigonometric one ...

あのー、先生？黒板に書いてあるの、指数関数じゃなくて三角関数ですけど・・・。

"What will trigonometric functions ever do for me in the future?!" "If you have time to whine, why don't get your housework done quickly instead?!"

「三角関数なんか勉強して将来何の役に立つんだよ」「ぶつぶつ言ってる暇があるならさっさと宿題済ませなさい」