Помогите , пожалуйста 1.) Упростить: 1.) sin x/ cos x - 2 tg x= 2.) tga * cos a + sin a= 3.) cos2a - (1-2 sin^2a)= 2.) Тригономичиские функции : 1.) tg 780 град. 2.) sin 420 град.
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