Demonstrem as seguintes indentidades tridonométricas:

a) cos x . tan x . csc x = 1
b)  tan^{2} x .  csc^{2} x = 1 +  tan^{2} x
c) (tan x + 1) (1 - tan x) = 2 - sec^{2} x
d) (tan x - sen x) ^{2} + (1 - cos x - 1) ^{2}
e) csc^{2} . tan x = cot x . sec^{2} x
f)sec^{2} x . csc^{2} x = sec^{2} x + csc^{2} x

ME AJUDEM POR FAVOR
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