a) ((-tgB)*(-cosB)*ctgB)/sinB*(-ctgB)*(-tgB)=ctgB
б) sinA*sinA-sinA*sinA=0
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a) ((-tgB)*(-cosB)*ctgB)/sinB*(-ctgB)*(-tgB)=ctgB
б) sinA*sinA-sinA*sinA=0