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Which expression could be used to determine the product of -4 and 3 1/4?

Find the given elements if matrix d:

Provide an example of a trigonometric function and describe how it is transformed from the standard trigonometric function f(x) = sin x, f(x) = cos x, or f(x) tan x using key features.

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie