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Trig Identities!

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scarab15

Done tons of trig identites and got them all, but this one is annoying me!

Prove: cotA/(1+cotA)= 1/(1+tanA)

Help please :)

12 years ago*

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9 Comments
MuratTheInfidel

no

12 years ago
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Wormy

cotA*(1/(1 + cotA))

Replace cotA with 1/tanA:

(1/tanA)*(1/(1+(1/tanA)))

Multiply top and bottom of quotient after the * by tanA:

(1/tanA)*(tanA/(tanA +1))

Do the multiplication (Divide by tanA):

1/(tanA+1)

12 years ago
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xarabas
(Junior Moderator)

i was just about to suggest that

12 years ago
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scarab15

Thank you!

12 years ago
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luffykat

NICELY DONE

12 years ago
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Gnu

my TI-89 Titanium says true :D

12 years ago
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OsManiaC

:(

12 years ago
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Shifted

Gahhh, I didn't finish school to see this ON STEAMGIFTS.
NOOOOOOOOOOOOOOOOOOOOOOOOOOOO

12 years ago
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GringoDC

sneaking in a homework question ? :D

12 years ago
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Closed 12 years ago by scarab15.