sin35° + sin55° = 2 * sin(35°+55°)/2 * cos(35°-55°)/2 = 2sin45° * cos10° = 2 * √2/2 * cos10° = √2 * cos10°
sin35° + sin55° = 2 * sin(35°+55°)/2 * cos(35°-55°)/2 = 2sin45° * cos10° = 2 * √2/2 * cos10° = √2 * cos10°