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Rearranging equation help plz

Forums: Science And Math
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cookiez
 
Reply Mon 21 Mar, 2005 04:33 pm
Hello, can anyone help me rearrange this equation:

P*cos(theta) = tan(alpha) * [ mg - P*sin(theta) ]

to get:

P = [ mg*sin(alpha) ] / [ cos (theta - alpha) ]

Working appreciated thanks! Very Happy
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Type: Discussion • Score: 1 • Views: 557 • Replies: 3
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raprap
 
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Reply Mon 21 Mar, 2005 04:45 pm
It reduces to the angle difference formula for Cosines
e.g. Cos(a-b)=Sin(a)Sin(b)+Cos(a)Cos(b)

Rap
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cookiez
 
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Reply Mon 21 Mar, 2005 04:52 pm
is this for the rearranging equations one? i still don't get it Confused
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raprap
 
  1  
Reply Mon 21 Mar, 2005 07:35 pm
No, put your function P into the equation, remember that tan=sin/cos, factor out common variables and rearrange to separate the trig variables. And the angle difference formula is the result.

Rap
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