Решите тригонометрические тождества(хотя бы одно):
1. cos^2 (x) + 3 cos(x) - 4 = 0
2. sin(3x) - sin(7x) = sqrt(3) sin(2x)
3. (cos((5pi/2)-L) - sin(L-pi/2)) * (sin(pi-L) + cos(3pi-L))
L=альфа
1. cos^2 (x) + 3 cos(x) - 4 = 0
2. sin(3x) - sin(7x) = sqrt(3) sin(2x)
3. (cos((5pi/2)-L) - sin(L-pi/2)) * (sin(pi-L) + cos(3pi-L))
L=альфа
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2)-16 sin x