senekal90
senekal90
19-08-2016
Mathematics
contestada
Simplify for 2 points cosx + cos(180º -x)
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Ckaranja
Ckaranja
19-08-2016
cos x+ cos(180-x)
=cos x + (cos 180)(cosx) +sin(180)(sinx))
=cos x+{-1(cos x)+0(sinx)
Note cos 18[tex] 0^{o} [/tex]=-1 sin 18[tex] 0^{o} [/tex]
= cos x-cos x
=0
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