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Forum » EDUCATION » MATHEMATICS » help math question please:---
help math question please:---
angelinaDate: Sunday, 26/Jan/2014, 12:59 | Message # 1
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i have this trig equation, 2cosx - 10sinx = 0 i need to solve for x, what is the best method i can use? please show me a way......
 
zulfaDate: Sunday, 26/Jan/2014, 13:04 | Message # 2





use Auxiliary method Rcos(x+y) = c where R = √(a^2 + b^2)
 
badshahDate: Sunday, 26/Jan/2014, 19:54 | Message # 3
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use t formula for sin and cosine to solve that question:

sin x = 2t/(1+t^2 ) and cos x = (1-t^2)/(1+t^2) then substitute into your equation then solve for t.

remember: t = tan 1/2(x) the use it to find the value of x then you'r done!! smile
 
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