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Trigonometry made completely easy!

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Trigonometry Topics

We have plenty of free lessons for you to watch

Right Triangle Trigonometry

–Use sine ratio to calculate angles and side (Sin = oh \frac{o}{h} ) (free lessons)
–Use cosine ratio to calculate angles and side (Cos = ah \frac{a}{h} )
–Use tangent ratio to calculate angles and side (Tan = oa \frac{o}{a} )
–Combination of SohCahToa questions (free lessons)
–Solving expressions using 45-45-90 special right triangles (free lessons)
–Solving expressions using 30-60-90 special right triangles
–Word problems relating ladder in trigonometry
–Word problems relating guy wire in trigonometry
–Other word problems relating angles in trigonometry

Trigonometric Ratios and Angle Measures

–Angle in standard position
–Coterminal angles (free lessons)
–Reference angle
–Find the exact value of trigonometric ratios
–ASTC rule in trigonometry (All Students Take Calculus) (free lessons)
–Unit circle (free lessons)
–Converting between degrees and radians
–Trigonometric ratios of angles in radians
–Radian measure and arc length
–Law of sines
–Law of cosines
–Applications of the sine law and cosine law

Graphing Trigonometric Functions

–Sine graph: y = sin x
–Cosine graph: y = cos x
–Tangent graph: y = tan x
–Cotangent graph: y = cot x
–Secant graph: y = sec x
–Cosecant graph: y = csc x
–Graphing transformations of trigonometric functions
–Determining trigonometric functions given their graphs

Applications of Trigonometry Functions

–Ferris wheel trig problems
–Tides and water depth trig problems
–Spring (simple harmonic motion) trig problems

Trigonometric Identities

–Quotient identities and reciprocal identities (free lessons)
–Pythagorean identities
–Sum and difference identities
–Cofunction identities
–Double-angle identities (free lessons)

Trigonometric Equations

–Solving first degree trigonometric equations (free lessons)
–Determining non-permissible values for trig expressions
–Solving second degree trigonometric equations
–Solving trigonometric equations involving multiple angles (free lessons)
–Solving trigonometric equations using pythagorean identities
–Solving trigonometric equations using sum and difference identities
–Solving trigonometric equations using double-angle identities

Inverse Trigonometric Functions

–Evaluating inverse trigonometric functions
–Finding inverse reciprocal trigonometric function from its graph
–Inverse reciprocal trigonometric function: finding the exact value
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