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i need solve for 18 question for Calculus 3  with full steps please  

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1 x 9)sec cos 1 sec sec 1 6 x / 6 1
1 1 ,
x 0
x sec x 6 6 sec sec 1 , as sec sec 1 x x x x 10)Let sin 1 x
x2 t sin t cos t 1 sin 2 t 1 2
4 4 x2
2 1 x 4 x2
Hence cos sin cos t 2 2...

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