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Mathematics: Post your doubts here!

ZaqZainab

ZaqZainab

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Thought blocker said:
In the first part in every this type of questions, the other two parts are very easy, but the first one breaks my confidence to solve the below ones. Bicharey kitne sad hote hain, when I dont solve 'em :(
Click to expand...
lol
the have asked for the surface area of a cylinder you know its general formula
but if you the one they have given dose not have an h :/ you need to figure out a way to write h in terms of r or constansts using the information in the question
 
Thought blocker

Thought blocker

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ZaqZainab said:
lol
the have asked for the surface area of a cylinder you know its general formula
but if you the one they have given dose not have an h :/ you need to figure out a way to write h in terms of r or constansts using the information in the question
Click to expand...
Is this the greatest boring 17th chapter of P1 o_O ?
 
Jelleh Belleh

Jelleh Belleh

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Faaiz Haque said:
Thought blocker can you reply please , read above
Click to expand...
I can show you how to solve the beginning part:-

1-tan^2x / 1+tan^2x
= ( (1/1) - (sin^2x/cos^2x) ) / ( (1/1) + (sin^2x/cos^2x) )
multiply both (1/1) by cos^2x in order to get common denominator
=> ( (cos^2x - sin^2x)/cos^2x ) / ( (cos^2x + sin^2x)/cos^2x)
both cos^2x denominators cancel out
continue

I hope it's clear.
 
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