Система тригонометрических уравнений
X+y=π/2⇒x=π/2-y sin²x-sin2y=1⇒sin²(π/2-y)-sin²y=1⇒cos²y-sin²y=1⇒cos2y=1⇒ 2y=0⇒y=0 x=π/2-0=π/2