Trigonometry is a branch of mathematics that studies relationships involving lengths and angles of triangles.

The 3rd-century astronomers first noted that the lengths of the sides of a right-angle triangle and the angles between those sides have fixed relationships: that is, if at least the length of one side and the value of one angle is known, then all other angles and lengths can be determined algorithmically.

These calculations are pervasive in both pure and applied mathematics with many applications in fields as diverse as physics, mechanical and electrical engineering, music and acoustics, astronomy, ecology, and biology. Trigonometry is also the foundation of surveying.

Trigonometry is most simply associated with planar right-angle triangles (each of which is a two-dimensional triangle with one angle equal to 90 degrees). The applicability to non-right-angle triangles exists, but, since any non-right-angle triangle (on a flat plane) can be bisected to create two right-angle triangles, most problems can be reduced to calculations on right-angle triangles. Thus the majority of applications relate to right-angle triangles.

Course Curriculum

Measurement of Angle 00:00:00
Trigonometric Ratios
Trigonometric Ratios 00:00:00
Real Definition of sine and cosine 00:00:00
Trigonometric Ratios of Allied Angles 00:00:00
Important Observations for T-Ratios 00:00:00
Trigonometric Ratios of Compound, Multiple & Sub-multiple Angles
Trigonometric Ratios of Compound Angles 00:00:00
Formulae & Identities 00:00:00
Trigonometric Ratios of Multiple & Sub-Multiple Angles 00:00:00
T-Ratios for some standard angles
T-Ratios of 18°, 36°, 54°, 72° 00:00:00
Conditional Identities
Conditional Identitiy 00:00:00
Maximum and Minimum of Trigonometric Functions
Maximum and Minimum of Trigonometric Functions 00:00:00
Special Trigonometric Identities
Summation of Trigonometric Series 00:00:00
Continued Product of Sine and Cosine series 00:00:00
Practice Problems
Practice Problems 00:00:00
TRI Mains quiz 01:00:00

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