the ð is suppose to be the pi symbol. it didn't work when i posted it!
in #1, why not add 4pi ?
tan(-3pi) = tan(-3pi + 4pi) = tan(pi)
your answer is correct
I don't see where the 9 came from in sin70 /9.
Since you have a right-angled triangle there is no need to use the Sine Law, just do..
tan 70 a/10
a = 27.4 (you had that)
cos 70 = 10/c
c = 10/cos70 = 29.23
you could have found c by Pythagoras
c^2 = 10^2 = 27.47477^2 = 29.23
#3 you did not finish
= sin 45º
= 1/√2 or √2/2
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