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The terms tan80^(@), tan70^(@)+tan10^(@)...

The terms `tan80^(@), tan70^(@)+tan10^(@) and tan10^(@)` are in

A

artithmetic progression

B

geometric progression

C

harmonic progression

D

none of these

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The correct Answer is:
A
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tan50^(@)-2tan10^(@)=

tan10^(@)-tan50^(@)+tan70^(@)

tan20^(@)tan40^(@)tan80^(@)

tan10^(@)-tan50^(@)+tan70^(@)=?

tan100^(@)+2tan70^(@)=

tan 70^(@) - tan 20^(@) -2 tan 40^(@)=

(tan80^(@)-tan10^(@))/(tan70^(@))

The value of tan10^(@)tan50^(@)tan70^(@) is

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