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find the value of cos-1 3/5+cos-14/5

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find the value of cos-1 3/5+cos-14/5

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Let  A = cos-1 3/5+cos-14/5

cosA = cos (cos-1 3/5) cos(cos-14/5) - sin(cos-1 3/5) sin(cos-14/5)

cosA =( 3/5 ) ( 4/5) - sin(sin-1 4/5) sin(sin-13/5)

cosA =( 3/5 ) ( 4/5) - ( 4/5)( 3/5 ) = 0

then A = pi/2

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