Verify this triganomic identity you can only use 1 side to solve (cosx-tanx)/(sinx+cosx)=cosx-secx

banganX 2021-01-19 Answered
Verify this triganomic identity you can only use 1 side to solve cosxtanxsinx+cosx=cosxsecx
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Expert Answer

gotovub
Answered 2021-01-20 Author has 98 answers

First we need to check the identity. Let x=0 then:
100+1=11, which isn’t true because 10, so the identity is false.
To confirm, let x=π4:
221s2=22, 12222
Therefore the identity has been wrongly stated. So the identity is actually an equation which has particular solutions for x. An identity has to be true for all x.

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