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The value of e^(log(10) tan 1^(o) +…. +...

The value of `e^(log_(10) tan 1^(o) +…. + log_(10) tan 89^(o) ` is

A

0

B

`e`

C

`(1)/(e)`

D

1

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  10. sqrt(3) cot 20^(circ)-4 cos 20^(circ)=

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  13. cos ^(2) 73^(circ)+cos ^(2) 47^(circ)+cos 73^(circ) . cos 47^(circ)=

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  14. cos 40^(circ)+cos 80^(circ)+cos 160^(circ)+cos 240^(circ)=

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  15. cos ^(4) (pi)/(8)+cos ^(4) (3 pi)/(8)+cos ^(4) (5 pi)/(8)+cos ^(4) (7 ...

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