Why sin 30°=cos 60° = - พิสูจน์หาค่าอัตราส่วนตรีโกณมิติ มุม 30° 45° 60

Cam Stater QS5-60A ON-OFF-ON Fort Ohm Saklar Ohmsaklar Cos 60 cos 60 cos 45o 4 8 sin 60 ° cos 30 ° cos 60 ° sin 30 ° wa Uw is = = AB = 3K Р 4K 4 tan Ꮎ b 3K 3 b 3 Cos Ꮎ h 5 h 5 b 3 sece and cot b 3 Р 4 4 3 16 cos sin cos −θ is in first quadrant in clockwise direction and in fourth quadrant in anticlockwise direction By ASTC rule, cosine is positive in fourth

cos thailand cos −θ is in first quadrant in clockwise direction and in fourth quadrant in anticlockwise direction By ASTC rule, cosine is positive in fourth