Question

Cos10+cos80/sin10+sin80=1

Answer 1

Evaluate cos(10)cos10 to get 0.984807750.98480775.0.98480775cos(80)−sin(10)sin(80)0.98480775⁢cos80-⁢sin10⁢sin80Evaluate cos(80)cos80 to get 0.173648170.17364817.0.98480775⋅0.17364817−sin(10)sin(80)0.98480775⋅0.17364817-⁢sin10⁢sin80Multiply 0.984807750.98480775 by 0.173648170.17364817 to get 0.171010070.17101007.0.17101007−sin(10)sin(80)0.17101007-⁢sin10⁢sin80Evaluate sin(10)sin10 to get 0.173648170.17364817.0.17101007−1⋅0.17364817sin(80)0.17101007-1⋅0.17364817⁢sin80Multiply −1-1 by 0.173648170.17364817 to get −0.17364817-0.17364817.0.17101007−0.17364817sin(80)0.17101007-0.17364817⁢sin80Evaluate sin(80)sin80 to get 0.984807750.98480775.0.17101007−0.17364817⋅0.984807750.17101007-0.17364817⋅0.98480775Multiply −0.17364817-0.17364817 by 0.984807750.98480775 to get −0.17101007-0.17101007.0.17101007−0.171010070.17101007-0.17101007Subtract 0.171010070.17101007 from 0.171010070.17101007 to get 0.0