integral ∫ { cosx / [ sinx +cosx] } dx
first
express the numerator in terms of the denominator and its derivative
split into two integrals ;one of them is of the form u' / u which
will integrate to ln(u)
PAGE 1 BASIC INTEGRATION
PAGE 2 INTEGRATION BY SUBSTITUTION
PAGE 3 INTEGRATION BY COMPLETION OF SQUARES
PAGE 4 INTEGRATION BY PARTS
PAGE 5 INTEGRATION BY MANIPULATION OF NUMERATOR IN TERMS OF DENOMINATOR
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