Quizzes & Puzzles19 mins ago
fao factor30
thanks for all your help, the non calculator paper was hard, but not impossible, there was a question with a grid with stuff like x + y + z = 10 then x + 2y + 3z = 28 etc etc with a grid of 9 expressions and you had to work out what x y and z were.
Plus, even though you helped me with simplifying, the last question was just that, and was impossibly hard!
Plus, even though you helped me with simplifying, the last question was just that, and was impossibly hard!
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For more on marking an answer as the "Best Answer", please visit our FAQ.I find that a lot of students don't know things like:
sin 30=cos60=1/2
cos 30=sin 60=root(3)/2
sin 45=cos 45=root(2)/2
and so tan 30=sin 30/cos 30=1/root(3)=root(3)/3
and tan 60=sin 60/cos 60=root(3)
and tan 45=1
sin 90=1 cos 90=0
if you know these you can do a lot without a calculator and often the root(2) and root(3) bits cancel out.
sin 30=cos60=1/2
cos 30=sin 60=root(3)/2
sin 45=cos 45=root(2)/2
and so tan 30=sin 30/cos 30=1/root(3)=root(3)/3
and tan 60=sin 60/cos 60=root(3)
and tan 45=1
sin 90=1 cos 90=0
if you know these you can do a lot without a calculator and often the root(2) and root(3) bits cancel out.