Question

Marque a sentença falsa:

A
sen²107º + cos²107º = 1
B
sec23º = 1/ cos23º
C
cossec²x = 1- cotg²x
D
cossecx = 1/senx

Answer 1

$\Large\boxed{\begin{array}{l}\sf cossec^2x=1-cotg^2x\\\huge\boxed{\boxed{\boxed{\boxed{\sf\red{\maltese}\blue{~alternativa~C}}}}}\end{array}}$