s.o.s help me pls exam problem
as the title says guys i am in a big trouble and i need your help
i have my maths exam tomorrow and i have these two questions that i can't answer so if anyone can help me i will reeeeeeeeeally appreciate it and do anything i can to help when they need some
so the questions are
Q1/ prove that
tan(x/2)=(1-cosx)/sinx
Q2/find the value of :
sin22.5 cos22.5
without using a calculator
ps :thanks for bothering to open this
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