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26 Mar 2020
More Reduction Formulas. By the Angle-Side-Angle Theorem from elementary geometry, triangles 
and 
in the figure to the right are congruent. Explain how this proves that if 
has coordinates 
, then 
has coordinates 
. Then explain how the figure shows that the following reduction formulas are valid:
More Reduction Formulas. By the Angle-Side-Angle Theorem from elementary geometry, triangles and in the figure to the right are congruent. Explain how this proves that if has coordinates , then has coordinates . Then explain how the figure shows that the following reduction formulas are valid:
Collen VonLv2
24 May 2020
. Explain how you can obtain all six cofunction identities from this triangle for 
.
and 
are complementary angles. So the cofunction identities state that “a trigonometric function of an angle 
of fencing and wants to fence off a rectangular field that borders a straight river. He does not need a fence along the river (see the figure). What are the dimensions of the field of largest area that he can fence?