Sin 6x = cos 4x
sin 6x - cos 4x = 0
cos (π/2 - 6x) - cos 4x = 0
-2 sin ((π/2 - 6x+ 4x)/2) * sin ((<span>π/2 - 6x - 4x)/2) = 0
-2 sin (</span>π/4 - x) * sin (π/4 - 5x) = 0
sin (π/4 - x) = 0 | sin(π/4 - 5x) = 0
π/4 - x = πk | π/4 - 5x = <span>πk
</span>x = π/4 - πk | x = π/20 - <span>πk/5
k </span>∈ Z<span>
Ответ: </span>x = π/4 - πk , x = π/20 - <span>πk/5 , k </span><span>∈ Z</span>
1) 47 868+112 812=160 680
2)160 680/52=3090
3)27 333+18 615=45 948
4)45 948/84=547
5)3090+547=3 637
Ответ: 3 637
Кут b= 135°:5=27°
Кутd =180°-(кут b+кут с)= 180°- (135°+27°)=180°-162°=18°
За 6 дней. За день и ночь улитка проползает по метру.
36+45=(30+6)+(40+5)=30+40+6+5=70+11=81.