Prove that, sin10°+sin20°+sin40°+sin50°= sin70°+sin80°
Prove that, sin10°+sin20°+sin40°+sin50°= sin70°+sin80° Solution: L.H.S = sin10°+sin20°+sin40°+sin50° = sin10°+sin50° +sin20°+sin40° = 2 sin$\frac{10° + 50°}{2}$ cos \frac{10° – 50°}{2} …
Prove that, sin10°+sin20°+sin40°+sin50°= sin70°+sin80° Solution: L.H.S = sin10°+sin20°+sin40°+sin50° = sin10°+sin50° +sin20°+sin40° = 2 sin$\frac{10° + 50°}{2}$ cos \frac{10° – 50°}{2} …