explain plz..

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- Jun 8th 2006, 07:48 AMxiaoztis oso!! HELP
explain plz..

- Jun 8th 2006, 08:39 AMJameson
You want answers to all of these?!?! Cmon now. At least try. Is there one in particular you need help on?

- Jun 8th 2006, 08:51 AMxiaoz
but i realli dunno!? my test i get 10/60 lei ?! if i no i would not hv fail so badly :(

- Jun 8th 2006, 10:57 AMThePerfectHacker
12,

$\displaystyle \sin x=\frac{\mbox{opposite}}{\mbox{hypotenuse}}=\frac{ 5}{8}$

Therefore,

$\displaystyle x=\sin^{-1}(5/8)\approx 38.9^o$

$\displaystyle \tan 40^o=\frac{\mbox{opposite}}{\mbox{adjacent}}=\frac {PQ}{5}$

Thus, solve for PQ, by mutiplying by five both sides,

$\displaystyle PQ=5\tan 40^o=\approx 4.2$

$\displaystyle \cos y=\frac{\mbox{adjacent}}{\mbox{hypotenuse}}=\frac{ 8}{13}$

Therefore,

$\displaystyle y=\cos^{-1} (8/13)\approx 52.0^o$ - Jun 8th 2006, 06:33 PMxiaoz
thxz.. i just dunno how to use all the formulas.. the toa cah soh and sin rule. cos rule all tis..