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(18^(-2))^(-1)*(3)/(sqrt(13))+cos^(-1)(1...

(18^(-2))^(-1)*(3)/(sqrt(13))+cos^(-1)(16)/(65)+(1)/(2)cos^(-1)(7)/(25)=pi

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Find the value of 2cos^(-1)(3)/(sqrt(13))+cot^(-1)(16)/(63)+(1)/(2)cos^(-1)(7)/(25)

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cos^(-1)x sqrt(3)+cos^(-1)x=(pi)/(2)

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If direction ratios of two lines are 5,-12,13 and -3,4,5 , then the angle between them is a) cos^(-1)((1)/(65)) b) cos^(-1)((2)/(65)) c) cos^(-1)((3)/(65)) d) (pi)/(2)