чему равен cos 115 градусов, и синус 75 градусов

Однокоренные слова к слову смелость

4х^2=9 и 3x^2-9=0 и 5x^2+1=0 плиз решите завтро сдать надо=)пож.

Чем опасен сепаратизм?

помогите пожалуйста.. нужно найти фрагмент в предложении, где допущена ошибка и исправить ее. 1) he felt rather tired although the journey across the chanel was quite comfortably. 2) hardly had she started weed the flower bed when it started to rain heavily. 3) New York is one of the world's cities that are noted for its busy harbour. 4) his daughter has startling intelligence despite she wastes most evenings playing computer games.