For years, students of mathematics have recalled the trigonometric ratios by remembering the Great Chief SOHCAHTOA.
Each letter of the Chief's name represents the name of one of the trig ratios or the name of a side of a right triangle. Sine of an angle = Opposite side / Hypotenuse
 Cosine of an angle = Adjacent side / Hypotenuse
 Tangent of an angle = Opposite side / Adjacent side
 Some Of Her Children Are Having Trouble Over Algebra.
 Some OutHouses Can Actually Have Totally Odorless Aromas.
 She Offered Her Cat A Heaping Teaspoon Of Acid.
 Soaring Over Haiti, Courageous Amelia Hit The Ocean And ...

Tom's Old Aunt
Sat On Her
Chair And Hollered.
 (from Ann Azevedo)  Stamp Out Homework Carefully, As Having Teachers Omit Assignments.
 Some Old Horse Caught Another Horse Taking Oats Away.
 Some Old Hippie Chasing Another Hippie Tripping On Apples.
 School! Oh How Can Anyone Have Trouble Over Academics?
 Oh Heck! Another Hour Of Algebra with Some Crazy Teacher.

Two Old Angels
Skipped Over Heaven
Carrying Ancient Harps 
Two Old Angels
Skipped Over Heaven
Carrying A Harp 
Oscar Had A Heap Of Apples
 you just have to remember the sine, cosine, tangent progression on your own.  Saddle Our Horses, Canter Away Happily, To Other Adventures.
 Silly old Henry, caught Albert Hugging two old Aunts.

Some Old Hulks
Carry A Huge
Tub Of Ale 
Stupid Old Hitler
Caused Awful Headaches
To Our Airmen 
Some Old Hag
Cracked All Her
Teeth On Asparagus 
Some Old Hairy
Camels Are Hairier
Than Others Are 
Smiles Of Happiness
Come After Having
Tankards Of Ale!!! 
The Cat Sat
On An Orange
And Howled Hard 
Some Opera Houses
Can Always Have
The Overture Again  Norman Sobieck from Michigan sent in the following:
Oscar Had A Heap Of Apples, Some Came Today!
 you just have to remember the Sine, Cosine, Tangent progression on your own.
Some = Oscar / Had
Came = A / Heap
Today! = Of / Apples
for the cosecant, secant, and cotangent functions...
Heather Ordered Harold An Albino Octopus, Cause She Can (or Could)
Cause = Heather / Ordered
She = Harold / An
Can! = Albino / Octopus  David Greenberg sent in the following from his late geometry teacher, Jerry Vouso:
Old Homes,
Are Homes,
Of Angels
 again, you just have to remember the Sine, Cosine, Tangent progression on your own.