共50条信息
在\(\triangle ABC\)中,\(∠A=60^{\circ}\),\(c=\)\(a.\)
\((1)\)求\(\sin C\)的值;
\((2)\)若\(a=7\),求\(\triangle ABC\)的面积.
已知函数\(f(x)=\sqrt{3}\sin \dfrac{x}{2}\cos \dfrac{x}{2}-{{\cos }^{2}}\dfrac{x}{2}+\dfrac{1}{2}\).
\((\)Ⅰ\()\)求函数\(f(x)\)的单调递减区间;
\((\)Ⅱ\()\)若\(\triangle ABC\)的内角\(A\),\(B\),\(C\)所对的边分别为\(a\),\(b\),\(c\),\(f(A)=\dfrac{1}{2}\),\(a=\sqrt{3}\),\(\sin B=2\sin C\),求\(c\).
已知函数\(f\left(x\right)= \sqrt{3}\sin \dfrac{x}{2}\cos \dfrac{x}{2}-{\cos }^{2} \dfrac{x}{2}+ \dfrac{1}{2} \).
\((1)\)求函数\(f(x)\)的单调递减区间;
\((2)\)若\(\triangle ABC\)的内角\(A\),\(B\),\(C\)所对的边分别为\(a\),\(b\),\(c\),\(f\left(A\right)= \dfrac{1}{2} \),\(a=\sqrt{3} \),\(\sin B=2\sin C\),求\(c\).
已知函数\(f(x)=1+2 \sqrt{3}\sin x\cos x-2{\sin }^{2}x,x∈R \).
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