<span>sin40=cos 60</span>
<span><span> tg60/sin40=<span> tg60/cos 60=sin 60=0,8660</span></span></span>
<span><span><span><span>4сos 100= -4Sin10= -0,1736</span></span></span></span>
<span><span><span><span>0,8660-0,6944=0,1716</span></span></span></span>
Должно быть вот так. Решение между - 7 и 0
1-D
2-B
1) 27*5 X^6 y^10
2) 16 a^4 b^20 * 25 a^14 b^4