URGENT MEDALS GIVEN PLEASE HELP

Question

anonymous · Answer

prove:tan2θ×cos2θ+cos2θ=1

melissa_something · Answer

Hold on. Is this multiple choice?

anonymous · Answer

no i just have to work it out to prove it but i d k how

anonymous · Answer

@Melissa_Something

melissa_something · Answer

Simplify the left side first.
Sin(20) + cos (20) = 1 because they are ratio identities

melissa_something · Answer

Add 0.34202014 and 0.93969262 to get 1.28171276

melissa_something · Answer

Since the left side dosent equal 1 this is false

anonymous · Answer

are you sure because i ran it through wolfram alpha to see if it was true or false before i tried to figure it out and it came up equal to one

anonymous · Answer

oh wait it looks wrong on here

melissa_something · Answer

No, this is really easy, you just plug it into the calculator ? o.o

anonymous · Answer

$$prove: \tan ^{2}\theta \times \cos ^{2}\theta + \cos ^{2}\theta=1$$

anonymous · Answer

@Melissa_Something this is what it is supposed to look like. Its trigonometry

melissa_something · Answer

Oh then yes 1=1 when simplified!

anonymous · Answer

but i cant figure out how to get the problem to equal 1? @Melissa_Something

melissa_something · Answer

Ok.  Tan^2 (0) will equal 0.
Cos(0) =1. One to any power is 1.
Mult. 1 by 0 to get 0.
Again, Cos(0) is 1 so 0+1^2 and 1 to any power is 1.
and 0+1 =1

melissa_something · Answer

1=1 :) It's so easy to do on the calculator

anonymous · Answer

I get it now!!!! THANKS!

melissa_something · Answer

np :)