Question

• sen²x*ctg²x+sen²x=1
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Answer 1

Explicación paso a paso:

${ \sin^{2}(x) } \times \frac{ cos^{2}(x) }{sin^{2}(x)} + sin^{2}(x) = 1$

$cos^{2}(x) + sin^{2}(x) = 1$