Saturday

August 30, 2014

August 30, 2014

Posted by **Alonso** on Tuesday, January 1, 2013 at 12:51pm.

decimal places.

6.Prove that tan y cos^2 y + sin^2y/sin y = cos y + sin y

10.Prove that 1+tanθ/1-tanθ = sec^2θ+2tanθ/1-tan^2θ

17.Prove that sin^2w-cos^2w/tan w sin w + cos w tan w = cos w-cot w cos w

23.Find a counterexample to shows that the equation sec a – cos a = sin a sec a is not an identity.

- Trigonometry -
**Reiny**, Tuesday, January 1, 2013 at 4:04pm1.

Some students like to look at these types the following way:

let tanx = y, to get

y^2 + y - 1 = 0

by formula ...

y = (-1 ± √5)/2

so tanx = (-1 ± √5)/2

using your calculator ....

x = 31.72° or 211.72°

or tanx = (-1 - √5)/2

x = 121.72° or 301.72°

#6, 10, 17,

establish correct order of operation, by using brackets.

#23

just pick any angle you want and use your calculator

or pick a = 30°, (you should know the trig values for 30°)

**Related Questions**

Trigonometry desperate help, clueless girl here - 2. solve cos 2x-3sin x cos 2x...

trigonometry - 5.Find the complete exact solution of sin x = -√3/2. 10. ...

trigonometry - 5. Find the complete exact solution of sin x = -√3/2. 9. ...

trig help much appreciated! :)) - 1. Find the complete exact solution of sin x...

precalculus - For each of the following determine whether or not it is an ...

Trigonometry - Please review and tell me if i did something wrong. Find the ...

Trig - Given: cos u = 3/5; 0 < u < pi/2 cos v = 5/13; 3pi/2 < v < ...

Mathematics - Trigonometric Identities - Let y represent theta Prove: 1 + 1/tan^...

trigonometry hlp me - 6.Prove that tan y cos^2 y + sin^2y/sin y = cos y + sin y...

MathsSs triG - Consider sin(x-360)sin(90-x)tan(-x)/cos(90+x) 1.A.SIMPLIFY sin(x-...