Practice problem
If csc(x)=7\csc(x)=7csc(x)=7 and 90∘<x<180∘90^{\circ}<x<180^{\circ}90∘<x<180∘, then find the exact value for sin(x2)\sin(\frac x2)sin(2x)
7+4514\sqrt{\frac{7+4\sqrt5}{14}}147+45
1514\sqrt{\frac{15}{14}}1415
7+4314\sqrt{\frac{7+4\sqrt3}{14}}147+43
7+4214\sqrt{\frac{7+4\sqrt2}{14}}147+42
Type a concept, like “slope” or “photosynthesis”.