1-sina*cosa*ctga=1-sina*cosa*(cosa/sina)=1-cos^2a
1.2x-2=1.5+0.2x+0.2
1.2x-0.2x=2+0.2
x=2.2
432
*432
--------
864
1296
1728
----------
186624
<span>15а^3+5b^4.
5(3a^3+b^4)
</span><span>16a^3b^4+4b^4-2a^3b^4.
14a^3b^4+4b^4
2b^4*(7a^3+2)
</span><span>18a^3b^4+5a^3b^4-2a^3b^4.
(18+5-2)a^3b^4
21a^3b^4
</span><span>18a^3b^6+2a^3b^2.
2a^3b^2*(9b^4+1)</span>