Wednesday

April 16, 2014

April 16, 2014

Posted by **suzi** on Saturday, February 26, 2011 at 2:57pm.

2) sec^2 2u-1/ sec^2 2u= sin^2 2u

3) cosB/1- sinB= secB+ tanB

- Math Help -
**Reiny**, Saturday, February 26, 2011 at 3:07pmPlease type your equations using brackets to show the proper order of operation.

The way you typed them, none are identities.

e.g.

for the last one you probably meant:

cosB/(1-sinB) = secB + tanB

then:

RS = 1/cosB + sinB/cosB

= = (1-sinB)/cosB * (1+sinB)/(1+sinB)

= (1 - sin^2 B)/(cosB(1+sinB)

= cos^2B/(cosB(1+sinB))

= cosB/(1+sinB)

= LS

- Math Help -
**suzi**, Saturday, February 26, 2011 at 3:16pm1)1+cos(3t)/ sin(3t) + sin(3t)/( 1+ cos(3t))= 2csc(3t)

2)sec^2 (2u-1)/ sec^2 (2u)= sin^2 (2u)

- Math Help -
**Reiny**, Saturday, February 26, 2011 at 3:32pmin 1) since all angles are 3t, I will let x = 3t for easier typing

Again, the way you typed it, it does not work.

You must have meant

(1+cosx)/sinx + sinx/(1+cosx) = 2cscx

LS = ((1+cosx)^2 + sin^2x)/(sinx(1+cosx))

= (1 + 2cosx + cos^2x + sin^2x)/(sinx(1+cosx))

= (2+2cosx)/(sinx(1+cosx))

= 2(1+cosx)/(sinx(1+cosx))

= 2/sinx

= 2cscx, but x = 3t

= 2csc(3t)

= RS

2) does not work the way you typed it.

- Math Help -
**suzi**, Saturday, February 26, 2011 at 3:43pm(sin^2 è+ cos^2 è)^3 =1

- Math Help -
**Reiny**, Saturday, February 26, 2011 at 3:55pm(sin^2 è+ cos^2 è)^3 =1

That is much too easy!!!!

what is the value of sin^2 è+ cos^2 è ?

**Related Questions**

Calculus AP - Evaluate the integral interval from [0 to pi] t sin(3t)dt Use ...

calculus/Trig - Suppose you wish to express sin(3t) in terms of sint and cost. ...

Trigonometry - I need help with I just can't seem to get anywhere. this is as ...

alegbra - what are the factor of the following trinomial? 3t^2 + 19t + 6 a) (t...

K - (a) Find the indeﬁnite integrals of the following functions. (i) f (t...

trigonometry - Verify that following are identities: 1. cos 3t = 4 cos³ t-3 cos ...

MATH - 1.)Find the exact solution algebriacally, if possible: (PLEASE SHOW ALL ...

Calculus - Simplify. State the nonpermissible values. (3t^2+3t-6/2t^2-2t-4)(4t^2...

Pre Cal - Sec^2 2u-1/Sec^2 2u = Sin^2 2u

Math - The lcm for... (1+3t) (1-9t)^2 (1-3t) Answer 9t^2 or (3t+1)(-3t+1) I'm ...