Объяснение:
N1
а) 2arctg(-1) + arccos(sqrt(3)/2) + arcsin(-1) = -2arctg(1) + arccos(sqrt(3)/2) - arcsin(1) = -π/2 + π/6 -π/2 = -π + π/6 = -5π/6
б) 48 + 1,5 = 49,5
в) 2^log2 (2) = 2^1 = 2
Sin²x+cos²x-6сos²x-4sinxcosx-cos²x+sin²x=0/cos²x
2tg²x-4tgx-6=0
tg²x-2tgx-3=0
tgx=a
a²-2a-3=0
a1+a2=2 U a1*a2=-3
a1=-1⇒tgx=-1⇒x=-π/4+πn,n∈z
a2=3⇒tgx=3⇒x=arctg3+πk,k∈z
Нок чисел 33 и 61 <span>2013</span><span>
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( a -ab) : (a)=a( 1 -a) : (a)=1 -a
(x - xy) : ( - x)=(xy-x ) : (x)=x(y-1 ) : (x)=y-1
( - m - mn) : m =m(-1-n) : m=-1-n
( - c + cd) :( - c)
=( cd - c) :( - c)=c( d - 1) :( - c)=d - 1