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Author Maths help in here :-s
barteh
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Registered: 18th Jan 05
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1st Feb 05 at 07:00   View User's Profile U2U Member Reply With Quote
Right, just trying to do compound angle formule and im a bit stuck, so if anyone can finish the question for me, showing all the working, that would be smashing

Ir= 5sinTheta + 2 sin (Theta + 45)

i know:
a = rcos alpha
b= rsin alpha

so:
2sin(Theta + alpha) = 1.51sin Theta + 1.41cos Theta
Ir= 5sinTheta + 1.41sinTheta+1.41cosTheta

= 6.41SinTheta + 1.41cos Theta
(now im stuck :-s), can anyone finish this off for me? its my las bloody question
Tim
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Registered: 21st Apr 00
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1st Feb 05 at 09:55   View Garage View User's Profile U2U Member Reply With Quote
Well 1.41 is root(2), so seperate out those terms. Then i'd personally look at squaring both sides as you'll get some sin2(theta)+cos2(theta) terms (which equal 1 -- trig identity), etc, etc...


[Edited on 01-02-2005 by Tim]
barteh
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Registered: 18th Jan 05
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1st Feb 05 at 10:20   View User's Profile U2U Member Reply With Quote
:-s
i should understand that.. but i dont lol
drunkenfool
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Registered: 7th Feb 03
Location: Hereford Drives: Audi R8 V8
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1st Feb 05 at 10:32   View User's Profile U2U Member Reply With Quote
are you using the...

sin(A + B) = sinAcosB + cosAsinB
cos(A + B) = cosAcosB - sinAsinB

rules? (i just woke up, sorry if thats no help!)
barteh
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Registered: 18th Jan 05
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1st Feb 05 at 11:15   View User's Profile U2U Member Reply With Quote
yep thats exactly what im using.

im told, that where im too now, i need to get it back into that form
barteh
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Registered: 18th Jan 05
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1st Feb 05 at 15:06   View User's Profile U2U Member Reply With Quote
Anybody?






no?



Dust
liamC
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Registered: 28th Feb 04
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1st Feb 05 at 15:16   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by barteh
Right, just trying to do compound angle formule and im a bit stuck, so if anyone can finish the question for me, showing all the working, that would be smashing

Ir= 5sinTheta + 2 sin (Theta + 45)

i know:
a = rcos alpha
b= rsin alpha

so:
2sin(Theta + alpha) = 1.51sin Theta + 1.41cos Theta
Ir= 5sinTheta + 1.41sinTheta+1.41cosTheta

= 6.41SinTheta + 1.41cos Theta
(now im stuck :-s), can anyone finish this off for me? its my las bloody question


THROW THE BASTARD IN THE BIN........
R Lee
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Registered: 15th Aug 03
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1st Feb 05 at 15:18   View User's Profile U2U Member Reply With Quote
a what what?

WTF?
barteh
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Registered: 18th Jan 05
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1st Feb 05 at 15:44   View User's Profile U2U Member Reply With Quote
i would if it wasnt my assignment.

out of 20 bloody questions , its just this one now! arrggg
barteh
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Registered: 18th Jan 05
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1st Feb 05 at 17:24   View User's Profile U2U Member Reply With Quote
^
Paul_J
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Registered: 6th Jun 02
Location: London
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1st Feb 05 at 17:35   View User's Profile U2U Member Reply With Quote
so you get 19 out of 20, is that the end of the world? - go down the pub and celebrate for finishing it and you'll forget all about it.

Otherwise the answer is 0.426

 
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