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1. sin3x + sinx = 0 sin2x cosx + cos2x sinx +sinx = 0 2sinx cosx cosx + (cos^2 x - sin^2 x) sin x + sinx = 0 2cos^2 x + cos^2 x - sin^2 x +1 = 0 3cos^2x + cos^2x = 0 4cos^2x = 0 Ill do the questions one by one... but i'm not sure if im right either... just here to learn :P

Thx ... :D Btw, when we use the auxillary method, do we have to state stuff like "where 0 < @ < pi/2 and tan @ = 4/3" If so, how was the range of 0 < @ < pi/2 worked out?

Just looked at this example... x = 3 cos 2t + 4 sin 2t = 5 cos (2t - @ ) where 0 < @ < pi/2 and tan @ = 4/3 How did x get simplified ot the second line, can anyone explain that? Thx

yea the answer is in pi/4 ... but is there a methodological way of doing it? Like step and step coz i don't think i will be able to use calculators for it in my coming exam...

How do you work out questions like: Inv. tan 1/2 + inv. tan 1/3 i.e. tan^-1 (1/2) + tan^-1 (1/3) Leaving answer in radian form... Thx

The first answer should be 2*1*4!=48 The second should be 4!\2!=12... Tell me if you want a more detailed answer.

I believe that question is in relation to osmosis. In the water, the water concentration of organism is higher than water, therefore it is easier for organisms to lose water to the water environment through osmosis. However in a land environment, the skin protects the water in the body from...

How do you want people to post a graph on the net....