# Graphing to determine identities

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Using Excel to graph, prove whether the following equation could possibly be an identity or determine if it is definitely not an identity.

Here is the problem:

cos t(pi/2 +1)= -sin t

https://brainmass.com/math/graphs-and-functions/graphing-determine-identities-110052

#### Solution Summary

This provides an example of graphing to determine if a given trigonometric function is an identity.

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