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ohh...i got it now!! huhuhu...i got another one wrong!!!argh

oh...i remember my solution for dat question iz 2pi/3 and 4pi/3 as -pi/2<@<pi/2 Am i right..or? *praying*

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....?

so 65/84 can get an e4?

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???

Solve: cos^2 ax^2 +sin2ax + 1= 0 i'm just starting on complex number...can u help me solve this question, plz?