don steward
mathematics teaching 10 ~ 16

Monday, 6 January 2020

exact trigonometric values

this diagram conveys a lot of information

you can find sin, cos and tan of 30, 60 and 45 degrees in surd (exact) form
but you can also, with a bit of work, find sin, cos and tan of 15 and 75 degrees in surd form

simplification requires rationalising the denominator

given some information about tan 15 and tan 75, you can find them in surd form:

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