1)cos(45°-a)-cos45°×cosa/sin(45°+a)-под корень2/2×sina
2)если cosa=-12/13,p/2<a<p то найдите sin2a и cos2a
3)tg(90°-a)×cos(270°-a)×cos(-a)/ctg(180°-a)×sin(270°-a)



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