image1670

^{C0S7 =} M^'^{cd| =} ^ ^cosy

P^c^l^CWBCl^+y)

Pai>c⁼ -\ACĄ\CD\■ sin x = — |j4C||C5|' cos^ ■ sin x ^pzdc = ^|CD||C5|- sinj = ^|_J4C||C5|^,sm_Ły cos*

p = p + p

^rA£C ^rADC ^rBDC

^\AC\\BC\ ■ sin {x + y)=j\AC\\BC\ ■ cos^ ■ sin* + ^\AC\\BC\ ■ sinj ■ cos x