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im just wondering why is it cos θ = sin (90 - θ)? can it be sin θ = cos(90-θ)?

thanks a lot!! that really really help me..

can somebody explain me this.. sin20+cos70 i dont really know how to do it.. i know its easy but im really confused,

well,japanese is really difficult, but i learned it for 4 months. if you really want to learn japanese you need to go japan and learn it there, thats the way i learn japanese,

i like exile too!! well arashi and exile are the best for me!!

i like arashi too!

actually im not sure if i want to be an astronaunt because i only want to see the space and i dont if i can do it, Is someone wants to be an astronaunt too? I want to ask why do you want to be,

i like arashi,exile,radwimps they are really awesome!!!