A trigonometric identity is an equation involving
trigonometric functions that holds true for all angles. These identities
are commonly called Pythagorean identities, because they come from
the Pythagorean theorem.
tan = sin /
sin2+ cos2= 1
The Math IC will test your knowledge of the trigonometric
identities by asking you to simplify a complex expression. Answering
these questions has more to do with memorizing the identities and
being good with algebraic substitution than it does with the theoretical
concepts of trigonometry. For example:
is (costan ) / (sin – cos2)?
To solve a problem like this, use the trigonometric
identities to simplify the trigonometric into sines and cosines.
After you have simplified the expression using the identities, it
is quite likely that the expressions will simplify further due to
the canceling of terms. The simplification of the expression in
the example question proceeds as follows:
Simplifying the mess given to you by the problem, you