trigonometry, specifically, sin/cos/tan: 0, 30, 45, 60, 90 that was something that caught me out.
there is also that zxf angles thing, congruency I think it was.
proof of trig and circle theorem is possible as well.
a personal rule of thumb I have is if it can be done on a calculator, there is probably some form that can also be done without it. (all calculator is non-calculator, but not all non-calculator is calculator if that makes sense?)
there is also that zxf angles thing, congruency I think it was.
proof of trig and circle theorem is possible as well.
a personal rule of thumb I have is if it can be done on a calculator, there is probably some form that can also be done without it. (all calculator is non-calculator, but not all non-calculator is calculator if that makes sense?)
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