If P=cos550,q=cos650 , r=cos1750 . Then the value of 1p+1q+rpq is equal to

1p+1q+rpq=p+q+rpq =cos550+cos650+cos1750cos550cos650 cos850+2cos120cos55cos550cos650 =0

If P=cos550,q=cos650 , r=cos1750 . Then the value of 1p+1q+rpq is equal to

1p+1q+rpq=p+q+rpq =cos550+cos650+cos1750cos550cos650 cos850+2cos120cos55cos550cos650 =0

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If $P = \cos 55^{0}, q = \cos 65^{0}$ , $r = \cos 175^{0}$ . Then the value of $\frac{1}{p} + \frac{1}{q} + \frac{r}{p q}$ is equal to

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$\frac{1}{p} + \frac{1}{q} + \frac{r}{p q} = \frac{p + q + r}{p q} = \frac{\cos 55^{0} + \cos 65^{0} + \cos 175^{0}}{\cos 55^{0} \cos 65^{0}} \frac{\cos 85^{0} + 2 \cos 120 \cos 55}{\cos 55^{0} \cos 65^{0}} = 0$

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If P=cos550,q=cos650 , r=cos1750 . Then the value of 1p+1q+rpq is equal to

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If $P = \cos 55^{0}, q = \cos 65^{0}$ , $r = \cos 175^{0}$ . Then the value of $\frac{1}{p} + \frac{1}{q} + \frac{r}{p q}$ is equal to