can show mi the step...thanx

if sin x=-0.6 and tan x = -0.75,then sec x is

1)-1.25

2)1.25

3)0.80

4)-1.35

Printable View

- May 11th 2006, 07:12 AMcheesepieneed help very urgent
can show mi the step...thanx

if sin x=-0.6 and tan x = -0.75,then sec x is

1)-1.25

2)1.25

3)0.80

4)-1.35 - May 11th 2006, 07:23 AMearbothQuote:

Originally Posted by**cheesepie**

1. You know that and

so

Therefore:

Thus the answer is 2)

Greetings

EB - May 11th 2006, 07:24 AMCaptainBlackQuote:

Originally Posted by**cheesepie**

so:

RonL - May 11th 2006, 07:35 AMearbothQuote:

Originally Posted by**CaptainBlack**

I'm a little bit confused, because I read a sin x = -0.6 in the problem of cheesepie.

Greetings

EB - May 11th 2006, 08:09 AMcheesepie
can u show mi the step of this question ? thanx

if cos x=0.6 and tan x is negative ,then csc x is

1)1.25

2)-1.25

3)0.80

4)0.75 - May 11th 2006, 09:07 AMCaptainBlackQuote:

Originally Posted by**earboth**

RonL - May 11th 2006, 01:37 PMearbothQuote:

Originally Posted by**cheesepie**

This problem is a tricky one, because you didn't give a value for tan(x). To be able to calculate a value I take the value from the previous problem: tan(x)=-.75

1. You know that and

and So you get:

= = =

This answer doesn't exist. So I presume, that my asumption about the value of tan(x) was incorrect. But maybe you can use my explanations when you plug in the right value for tan(x).

Greetings

EB - May 11th 2006, 05:33 PMtopsquarkQuote:

Originally Posted by**cheesepie**

Thus:

Since tan x is negative, sin x = -0.8

Thus csc x = 1/sin x = 1/-0.8 = -1.25

-Dan