\((1)\)在单调递增的等差数列\(\{a_{n}\}\)中,已知\(a_{3}=1\),\({{a}_{2}}{{a}_{4}}=\dfrac{3}{4}\),则\(a_{1}=\)________.
\((2)\)已知两个单位向量\(a\),\(b\)的夹角为\(60^{\circ}\),\(c=ta+(1-t)b\),若\(b⊥c\),则\(t=\)________.
\((3)\)在\(\triangle ABC\)中,\(AB=2\),\(AC=3\),\(BC\)边上的中线\(AD=2\),则\(\triangle ABC\)的面积为________.
\((4)\)已知函数\(f(x)\)是定义在\(R\)上的奇函数,当\(x < 0\)时,\(f(x)\)单调递增,且\(f(-1)=0\),设\(φ(x)=\sin ^{2}x+m\cos x-2m\),集合\(M=\{m\}\)对任意的\(x∈[0,\dfrac{\pi }{2}]\),\(φ(x) < 0\}\),\(N=\{m\}\)对任意的\(x∈[0,\dfrac{\pi }{2}]\),\(f(φ(x)) < 0\}\),则\(M∩N=\)________.