Hi there!

It’s not a question but a trick to remind all those trigonometric ratios – helpful for all

sin0= ½ *0

sin 30= ½ * √1

sin 45= ½ * √2 which is = √2/2 = 1/√2

sin60= ½ * √3 √3/2

sin90 = ½ * √4 =1

Hope this helps

I have more east wayIt is so simple..take the trigonometry ratio tableAnd memories it. It will take 3 min.Just learn 1st column Then learn it opposite for cos columnThen learn tan columnThen learn opposite for cotThen for cosec do sin upside downSimilarly for sec with cos