- Standard Substitutions
- For terms of the form x2 + a2 or put x = a tan or a cot
- For terms of the form x2 – a2 or put x = a sec or a cosec
- For terms of the form a2 – x2 or put x = a sin or a cos
- If both are present then put x = a cos
- For the type put x = a cos2 + b sin2
- For the type put the expression within the bracket = t
- For the type put
- For again put (x + a) = t (x + b)
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