trig Identities 1

Mathematics
Tutor: None Selected Time limit: 1 Day

Which of the following counterexamples proves that secxtan x=sinx  is not a trigonometric identity? Select all that apply.

Dec 17th, 2014

Neither pi nor 3pi would show this because both tan x and sin x are 0 at these values 

but the other two show the difference 

1/cos(3pi/4) tan(3pi/4) =1/-cospi/4 * -tam pi/4 = sqr2

But right side is sin3pi/4 =sinpi/4 =1/sqr2

Now pi/3:

1/cospi/3 * tanpi/3 = 2*sqr3/2 = sqr3

but sin pi/3 = sqr3/2


Dec 17th, 2014

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Dec 17th, 2014
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Dec 17th, 2014
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