"電卓" "数字以外の値" "エラー" "." "0" "1" "2" "3" "4" "5" "6" "7" "8" "9" "cos" "ln" "log" "sin" "tan" "clr" "del" "自然対数の底" "パイ" "ポイント" "左かっこ" "右かっこ" "コサイン" "自然対数" "対数" "サイン" "タンジェント" "足す" "割る" "階乗" "掛ける" "累乗" "平方根" "引く" "クリア" "削除" "イコール"