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so when i try to solve exactly what for example sin135 is. i start by changing 135 to (9pi)/2 and start solving. but then when i reach sin(pi/2)xcos(pi/4)+cos(pi/2)xsin(pi/4)
sqrt2/2 i just check on my paper what like sin(pi/2) is and all the other ones so i can continue. but how do i solve what sin(pi/2) is? or is that just something you know without trying to solve it and just check on a paper?

2+2 is 4 minus 1 that's 3 quick maths

135 is actually 5pi/4 firstly

135 is 9pi/12???

Yea soz it's pi/4 + pi /2 so 3pi/4

I dont know who the fuck give sin that name and decide all that shit, and I dont use it to win money or something thats why I dont give a damn about it

memorize the unit circle /close

yes i have done that. im just scared if i have to solve those on the test and not just know them.

i dont know but 45+45=90 90-45=45 45-45=0
90=0

uninstall math, not needed in life
<- pro C++ developer for 15+ years. only math needed: +-/*