Cos(П-а)+cos(3П/2+a)/1+2cos(-a)sin(-a)

Question

Cos(П-а)+cos(3П/2+a)/1+2cos(-a)sin(-a)

Answer 1

= (-cosα+sinα) / (sin²α+cos²α - 2 sinα cosα = (sinα-cosα) / ((sinα-cosα)*(sinα-cosα))=
=1/(sinα-cosα)

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