Question

Demuestras las identidades siguientes.
1. sen a cot a = cos a

Answer 1

Hola.

Tenemos

$sen(\alpha )*cot(\alpha ) = cos(\alpha )$         (cot = cos / sen)

$sen(\alpha ) * \frac{cos(\alpha )}{sen(\alpha )} = cos(\alpha )$         ( se reduce sen )

$cos(\alpha )= cos(\alpha )$   ===> demostrado

Un cordial saludo