# Pre Calculus

posted by .

Establish the following identity

tan(x+pi/4)=1+tanx/1-tanx

• Pre Calculus -

Use the tan (x + y) formula.

tan(x+y) = (tanx + tany)/(1 - tanx tany)

with y = pi/4, tany = 1

Your right hand side should have parentheses

## Similar Questions

1. ### Math

1)A piano tuner uses a tuning fork. If middle C has a frequency of 264 vibrations per second, write an equation in the form d=sinw(t) for the simple harmonic motion. 2) Verify the identity tan^2X-cot^2X/tanX+cotX=tanX-cotX I'm not …
2. ### Pre Cal

could someone please tell me what the other angle identity of tan is?
3. ### Trig

Verify that each of the following is an identity. tan^2x-sin^2x=tan^2xsin^2x I can get it down to cos^2 on the right, but cannot get it to work out on the left. secx/cosx - tanx/cotx=1 On the left I got down to 1-tan^2, but that clearly …
4. ### Trigo

Given that a^2+b^2=2 and that (a/b)= tan(45degee+x), find a and b in terms of sinx and cosx. I don't know what i'm supposed to do, and i don't come to an answer! Help, thanks! my workings: tan(45+x)= (1+tanx)/(1-tanx) a/b = (1+tanx)/(1-tanx) …
5. ### Trigonometry

Given that a^2+b^2=2 and that (a/b)= tan(45degee+x), find a and b in terms of sinx and cosx. I don't know what i'm supposed to do, and i don't come to an answer! Help, thanks! my workings: tan(45+x)= (1+tanx)/(1-tanx) a/b = (1+tanx)/(1-tanx) …
6. ### Pre-Cal

Perform the addition or subtraction. tanx - sec^2x/tanx tan^2(x)/tan(x) - sec^2x/tanx = tan^2x sec^2x / tanx then I use the identity 1+tan^2u=sec^2u I do not know what to do at this point.
7. ### Pre Calculus

Establish the following identity Sin2x/1+cos2x=tanx
8. ### Pre Calculus

Establish the identity tanx/2=cscx-cotx
9. ### trigonometry (please double check this)

Solve the following trig equations. give all the positive values of the angle between 0 degrees and 360 degrees that will satisfy each. give any approximate value to the nearest minute only. a.) ( I got confused doing this 1 can you …
10. ### pre cal

verify each identity tan(x/2)=tanx/secx+1

More Similar Questions

Post a New Question