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

Are you studying on the go? Check out our FREE app and post questions on the fly!
Download on the
App Store
...
Dec 17th, 2014
...
Dec 17th, 2014
Dec 8th, 2016
check_circle
Mark as Final Answer
check_circle
Unmark as Final Answer
check_circle
Final Answer

Secure Information

Content will be erased after question is completed.

check_circle
Final Answer