Page 46 - modul trigonometri bilingual
P. 46
Example 3.2
2
Prove the following trigonometric identity cos = csc × cos
tan + cot
Alternative Solutions
The shape of the right segment of the equation is changed so that it
is equal to the shape of the left segment
Right field:
csc + cos
tan + cot
1
sin × cos
=
sin cos
cos + sin
cos
sin
=
2
2
sin + cos
sin cos
cos
sin
=
1
sin cos
cos
= × sin cos
sin
2
= cos
= left field (proven)
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