11.375+0.35y=71.4
0.35y=60.025
y=171.5
<h3>2cosx = sin2x•cosx</h3><h3>2cosx - sin2x•cosx = 0</h3><h3>cosx•( 2 - sin2x ) = 0</h3><h3>1) cosx = 0 ⇒ x = п/2 + пn , n ∈ Z</h3><h3>2) 2 - sin2x = 0 ⇒ sin2x = 2 ⇒ - 1 ≤ sint ≤ 1 ⇒ ∅</h3><h3><em><u>ОТВЕТ: п/2 + пn, n ∈ Z</u></em></h3><h3><em><u /></em></h3>
18x-10-2x+26=0
16x=10-26
16x=-16
x=-1