Resposta :
[tex]\Large\boxed{\begin{array}{l}\sf cossec^2x=1-cotg^2x\\\huge\boxed{\boxed{\boxed{\boxed{\sf\red{\maltese}\blue{~alternativa~C}}}}}\end{array}}[/tex]
[tex]\Large\boxed{\begin{array}{l}\sf cossec^2x=1-cotg^2x\\\huge\boxed{\boxed{\boxed{\boxed{\sf\red{\maltese}\blue{~alternativa~C}}}}}\end{array}}[/tex]