Vocabulary consisting only from characters you are able to read
切線
せっせん
tangent (in trigonometry)mix
山川
さんせん; やまかわ; やまがわ
mountains and rivers; mountains and rivers; mountain riversmix
分の
ぶんの
denominator bun no numerator (in writing common fractions), X Yth's (Y bun no X)jlpt3, math