Cos (3π<span>/2+x)=-1/2
cos(3</span>π<span>/2+x)=-sinx
-sinx=-1/2 <em>делим обе части на -1</em>
sinx=1/2
x=(-1)^n * arcsin1/2 +</span>π<span>n, n</span>∈Z<span>
x=</span>(-1)^n*π/6 +πn, n∈Z
Ответ x=(-1)^n*π/6 +πn, n∈Z
q=b2/b1=32/64=0.5
S10=64*(1-0.5^10)/(1-0.5)=63,9375/0,5=127,875
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