verify the identity:
cos x sex x =1
tanx scs x cos x =1
2-sec^2x=1-tan^2 x
does anyone get this?
Answers:
I can do the last one.
You need to substitute (tan^2x + 1) for sec^2x.
This is one of the Pythagorean identities.
Then the equation is
2 - tan^2x + 1 = 1 - tan^2x
When you combine the numbers on the left side you will have 1 - tan^2x.
i am assuming you mean:
cosxsecx=1
since secx = 1/cosx;
you get cosx(1/cosx)
cosx/cosx = 1
tanxscsxcosx=1
I am assuming you mean :
tanxcscxcosx
since cscx=1/sinx;
you get : tanx (1/sinx) cosx
tanx (cosx/sinx)
since tanx = sinx/cosx;
you get sinx/cosx (cosx/sinx) = 1
2-sec^2x=1-tan^2x;
doesn't make any sense to me. Maybe i'm a little rusty on trignometry. srry
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