# Math

How would you show that one trigonometric expression is equal to another? I’m not exactly sure how to start.

1. 👍
2. 👎
3. 👁
1. start by using the most basic identities:
tanx=sinx/cosx
sin^2x + cos^2x = 1

by dividing by cos^2x you get

tan^2x+1 = sec^2x

divide by sin^2x and you get

1+cot^2x = csc^2x

There should be a section in your text covering trig identities. It will start out with simple ones like these and move on to more complicated ones.

1. 👍
2. 👎
2. Okay, thank you Steve!

1. 👍
2. 👎

## Similar Questions

1. ### Trigonometry help

If sin(x) = 1/3 and sec(y) = 13/12 , where x and y lie between 0 and π/2, evaluate the expression using trigonometric identities. (Enter an exact answer.) sin(x + y)

2. ### Math

If sin(x) = 1/3 and sec(y) = 29/21 , where x and y lie between 0 and π/2, evaluate the expression using trigonometric identities. (Enter an exact answer.) cos(2y)

3. ### Math

Which of the following sets of ordered pairs represents a function? {(5,2),(2,6),(5,10),(1,2)} {(-3,2),(2,6),(5,2),(1,7)} {(-3,2,(2,6),(3,10),(1,7)} {(-3,2),(2,6),(5,10),(2,-1)} ^dont get this one.. Which expression is equal to

4. ### Math

Hi everyone, my name is Emerson. I was wondering if anybody could help me on a test. I'm stuck on some, but I think I know some others. Thank you! 1. Translate the phrase "nine more than two times a number" in to an algebraic

1. ### math

use even and odd properties of the trigonometric functions to find the exact value of the expression. sin(−π/6)

2. ### Math! Please Check My Awnser!

Hello! I need some help with math! I have tried to do this but I am unsure about my answers. My I will identify my answers with a "

3. ### Math

1.) An expression is show: √21x; for which value of x should the expression be further simplified? a.) 5 b.) 8 c.) 37 d.) 54 2.) An expression is show: √42x; for which value of x should the expression be further simplified?

Rewrite the expression tan(90°−θ)sinθ as one of the six trigonometric functions of acute angle thetaθ. Please show work + answer. I have a few of them to do. Thanks.

1. ### trig

Simplify and write the trigonometric expression in terms of sine and cosine: cot(-x)cos(-x)+sin(-x)=-1/f(x)=f(x)=____________ I've tried everything, I think that the "-1/f(x)" part is screwing up my answer but I'm not sure what

2. ### math

Simplify and write the trigonometric expression in terms of sine and cosine: tan^2 x-sec^2 x=

3. ### cal

If sin(x) = 1/3 and sec(y) = 13/12 , where x and y lie between 0 and π/2, evaluate the expression using trigonometric identities. (Enter an exact answer.) sin(x + y)

4. ### math help?!

If x = 6sinθ, use trigonometric substitution to write square root 36-x^2 as a trigonometric function of θ, where where 0