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An introduction to Trigonometry.

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This is an elementary introduction to everything trigonometry to come. Once you understand this part, you will not have any challenge whatsoever trigonometry.

Institution
12th Grade
Course
Mathematics

Content preview

Tuesday, March 10, 2026 3:42 PM




Category Identity / Formula Notes / Usage
The Map Pythagoras (Radius is always
positive)
The Map Opposite/ Hypotenuse



The Map Adjacent/ Hypotenuse



The Map Slope



Quotient Use to simplify fractions


Square The "God" Identity


Square Derived from above

Square Derived from above

Double Angle Expanding a double angle


Double Angle Version 1


Double Angle Version 2 (Best for Half-Angles)


Double Angle Version 3 (Best for Half-Angles)


Compound Watch the signs


Compound Sign flips in the middle



Quadrant Angle Range Coordinates Positive Ratio
Q1 ALL ( )




TRIGONOMETRY Page 1
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Institution
12th Grade
Course
Mathematics
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Uploaded on
June 2, 2026
Number of pages
3
Written in
2025/2026
Type
Class notes
Professor(s)
Ndlovu
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