Qualification > Math

math doubts [NEW]

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zara:

--- Quote from: A@di on October 31, 2009, 11:49:56 am ---first find x

sin-1 2/5 = 23.5

cos2 x = 0.84

and

tan2x = 0.19

just substitute and find it
---
next

(1/cos x + sinx/cosx) = (1+sinx/ cos x) * (1-sinx/1-sinx) = 1-sin2x/cosx - sinxcosx = cos2x/cosx-sinxcosx

= cos2x / cosx(1-sinx) = cosx/1-sinx

x = theta

LHS = RHS

hence proved

--- End quote ---
adi how u got cos2=0.84? n same for tan?

Ghost Of Highbury:
find cos x --> square the answer

zara:

--- Quote from: A@di on October 31, 2009, 12:04:33 pm ---find cos x --> square the answer

--- End quote ---
how?

Ghost Of Highbury:

--- Quote from: Z.J. on October 31, 2009, 12:16:21 pm ---how?

--- End quote ---

calculator?

zara:
oh shoot!
lol thts wht hppns ven im doin many things at a time...
now i get the whole thing....Thanks...

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