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## Homework Statement

1)

COS4[tex]\theta[/tex]-COS2[tex]\theta[/tex][tex]/SIN4\theta-SIN2\theta[/tex]=-TAN3[tex]\theta[/tex]

2)sinx/cosx+1 + cosx-1/sinx = 0

## Homework Equations

1) Verify

2)verify

## The Attempt at a Solution

1)

cos(2[tex]\theta[/tex]-2[tex]\theta[/tex])-cos2[tex]\theta[/tex] / sin(2[tex]\theta[/tex]+sin2[tex]\theta[/tex])-sin2[tex]\theta[/tex]

when simplified i get a large answer :S

2)

sinx/cosx+1 X cos-1/cos-1(reciprocal) + cos-1/sinx

= sinx cosx-1/ cos2 -1 + cosx-1/sinx

=sinx cosx-1/ Sin2x + cosx-1/sinx

=cosx-1/sinx + cosx-1/sinx

=2(cosx-1)/sinx :S

thats it i hope u can read it

formulas used

Trigonometric Identities

sum and difference Formulas of cosines and sines

and double angle formulas

my problem is that there is so many formulas and its hard to tell which one to use

they are all usable but not all give u the answer

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