Question

(2-2/sin^2(p+a))((1/cos^2(a-p))-1) Упростить

Answer 1

***********************************

Answer 2

$(2- \frac{2}{sin^2( \pi +a)})( \frac{1}{cos^2(a- \pi )}-1)=(2- \frac{2}{sin^2a})(( \frac{1}{cos^2a} -1)=\\\\= \frac{2sin^2a-2}{sin^2a}* \frac{1-cos^2a}{cos^2a}= \frac{2(sin^2a-1)*sin^2a}{sin^2a*cos^2a}= \frac{-2(1-sin^2a)}{cos^2a}= \frac{-2cos^2a}{cos^2a}=-2$