i think there is a mistake in his solution though....in question 3c(iii) as -pi/2<@<pi/2...so @ cant be +-pi/3 as in his solution.im not sure which is the correct answer though!! am i right or....?
i know that i should use quadratic formula, but i can not solve it......i'm really stuck ...but the answer is -tan a+- i
i dunno how to get the answer...can u plz show me???