Question

• (1+tan²x)*cos²=1

• sen²x*ctg²x+sen²=1

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Answer 1

Explicación paso a paso:

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

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

2.

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

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