Помогите дурному человеку(
1. 2sin x-1<0
2. Обчисліть : (tg33°+tg41°/1-tg33° tg41°)-ctg 16°
1. 2sin x-1<0
2. Обчисліть : (tg33°+tg41°/1-tg33° tg41°)-ctg 16°
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12sinx<1
sinx<1/2
x∈(5π/6+2πk;13π/6+2πk,k∈z)
2
(tga+tgb)/(1-tgatgb)=tg(a+b)
(tg33+tg41)/(1-tg33tg41)-ctg16=tg(33+41)-ctg16=tg74-ctg16=
tg(90-16)-ctg16=ctg16-ctg16=0