Вот держи программа photomath
4) 56*2/7=16
x^5*x^2=x^7
16x^7y^15
5)45p^3k^2
6)15/2b^5c^9d^10
<span>sinxcos2x-sin3x=0 ;
</span>sinxcos2x-sin(x+2x) =0 <span>;
</span>sinxcos2x-(sinxcos2x+sin2xcosx) =0 <span>;
</span>sinxcos2x- sinxcos2x - <span>sin2xcosx =0 ;
</span>- sin2xcosx =0 ;
sin2x =0 ⇒2x =π*k⇔ x=π*k/2 ;k<span>∈Z.
</span>cosx =0 ⇒x = π/2 +π*k ;k<span>∈Z.</span>
2х-34х=-289
-32х=-289
х=9 1/289