cos
+ cos2
= p
sin
+ sin2
= q
Squaring and adding the equations, we get
p
2+q
2 = 2+2(cos
cos2
+sin
sin2
) = 2+2cos
Hence cos
= p
2+q
2/2 - 1
Let p2+q2 = 2m
Hence cos
= m-1
cos2
= 2(m-1)
2 - 1 = 2m
2 -4m+1
From eqn 1,
cos
+ cos2
= p
Hence 2m
2-3m = p where m = p
2+q
2/2 thus eliminating
sorry sboosy, I didnt know you were on to this one!
Moderation Team
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