Practice problem
If cos(x)=23\cos(x)=\frac23cos(x)=32 and xxx is in quadrant I, then find an exact value for sin(2x)\sin(2x)sin(2x)
439\frac{4\sqrt3}{9}943
89\frac{8}{9}98
459\frac{4\sqrt5}{9}945
469\frac{4\sqrt6}{9}946
Type a concept, like “slope” or “photosynthesis”.