Respuesta :

Answer:

It is equal to 0.

Step-by-step explanation:

I can simplify it as follows:

sinα sin(90 - α) - cos(90 - α)(cosα)

Now  sin(90 -α) = cosα and cos(90 - α) = sinα)    ( for α < 90)

So the expression becomes:

sinαcosα - sinαcosα

= 0 .

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