what would be the answer when you plug 5pi/4 into this equation 6sec^2x-7sinx for x? i cant get the answer need some help

Answer 1

With what you are not able to calculate the above?

If you are using a calculator, make sure you know how to set the angle input to radians. By default, most calculators work in degrees.

sec²(x)
=sec²(5π/4)
=1/(-sqrt(2)/2)²
=2
sin(5π/4)
=sqrt(2)/2
So
6sec^2x-7sinx = ?

Answer 2

should read:
sin(5π/4)
=-sqrt(2)/2

Answer 3

what would be the answer?

Answer 4

i don't know what would be the answer

Answer 5

Daniel, this is homework help.

Do I understand that you are not able to calculate
6sec^2x-7sinx
when sec(x)^2 and sin(x) have been calculated for you?
Or is it that the answer that you've got does not match?

Please clarify.

Answer 6

6 sec^2 (5?/4) - 7 sin (5?/4) =
= 6 (1/(-1/sqrt(2)))^2 - 7 (-1/sqrt(2))
= 6 (2) + 7/sqrt(2)
= 12 + 7/sqrt(2)