Mnemonics

[Jeza]

How many do you know?
I can think of.
Richard of York gave battle in vain.
Divorced, beheaded, died, divorced, beheaded survived.
Mums very erupting mulberry jam sandwiches under normal pressure.
I realise that the P is no longer relevant.
At the moment I can't think of anymore. CAN YOU?

[Cloverjo]

Trigonometry: sin=opposite/hypotenuse. Cos=adjacent/hypotenuse. Tan=opposite/adjacent