Lectures in Trig Identities
Lecture 1: Basic Identities
Lecture 2: Cofunction Identities
Lecture 3: Simplify The Trig Expression: 1
Lecture 4: Simplify The Trig Expression: 2
Lecture 5: Verify The Identity: 1
Lecture 6: Verify The Identity: 2
Lecture 7: Verify The Identity: 3
Lecture 8: Verify The Identity: 4
Lecture 9: Addition And Subtraction Formulas
Lecture 10: Proof Of Addition Formula (Cosine)
Lecture 11: Proof Of Subtraction Formula (Cosine)
Lecture 12: Proving The Cofunction Idenity
Lecture 13: Proof Of Addition Formula (Sine)
Lecture 14: Proof Of Subtraction Formula (Sine)
Lecture 15: Proof Of The Addition Formula (Tangent)
Lecture 16: Proof Of The Subtraction Formula (Tangent)
Lecture 17: Find Sin75,...Tan135 (Without A Calculator)
Lecture 18: Proof Using Addition & Subtraction Formulas
Lecture 19: Proof Using Addition & Subtraction Formulas
Lecture 20: Proof Using Addition & Subtraction Formulas
Lecture 21: Proof Using Addition & Subtraction Formulas
Lecture 22: Double Angle Formula: Introduction
Lecture 23: Double Angle Formula Proved: Sine
Lecture 24: Double Angle Formula Proved: Cosine
Lecture 25: Double Angle Formula Proved: Tangent
Lecture 26: Simplifying Triple Angles To A Single Angle
Lecture 27: Formula For Lowering Power Cos^2(X)=?
Lecture 28: Formula For Lowering Power Sin^2(X)=?
Lecture 29: Formula For Lowering Power Tan^2(X)=?
Lecture 30: Proof Sin^2(X)=(1-Cos2X)/2
Lecture 31: Proof Cos^2(X)=(1+Cos2X)/2
Lecture 32: Proof Half Angle Formula: Sin(X/2)
Lecture 33: Proof Half Angle Formula: Cos(X/2)
Lecture 34: Proof Half Angle Formula: Tan(X/2)
Lecture 35: Product To Sum Formula 1
Lecture 36: Product To Sum Formula 2
Lecture 37: Sum To Product Formula 1
Lecture 38: Sum To Product Formula 2
Lecture 39: Write Sin(2X)Cos3X As A Sum
Lecture 40: Write Cos4X-Cos6X As A Product
Lecture 41: Prove Cos^4(X)-Sin^4(X)=Cos2X
Lecture 42: Prove [Sinx+Sin(5X)]/[Cosx+Cos(5X)]=Tan3X
Lecture 43: Prove (Sina+Sinb)/(Cosa+Cosb)=Tan[(A+B)/2]
Lecture 44: Prove Sin(4X)/Sinx=4Cosxcos(2X)
Lecture 45: Solve Cos(Theta)+1=0, Theta=?
Lecture 46: Solve 3Sin(Theta)-1=0, Theta=?
Lecture 47: Solve Tan^2(Theta)-4=0, Theta=?
Lecture 48: Solve 2Sin^2(Theta)-Sin(Theta)-1=0, Theta=?
Lecture 49: Solve 2Cos^2(Theta)-7Cos(Theta)+3=0, Theta=?
Lecture 50: Solve Cos(X)Sin(X)-2Cos(X)=0, X=?
Lecture 51: Solve 3Tan(X)Sin(X)-2Tan(X)=0, X=?
Lecture 52: Solve 3Tan^3(Theta)=Tan(Theta), Theta=?
Lecture 53: Solve Sin(2Theta)+Cos(Theta)=0, Theta=?
Lecture 54: Solve Sin(Theta)+Sin(3Theta)=0, Theta=?
Lecture 55: Solve 2Cos(3Theta)=1, Theta=?
Lecture 56: Solve Sin(2Theta)=3Cos(2Theta), Theta=?
Lecture 57: Solve 2Sin(X)Tan(X)-Tan(X)=1-2Sin(X), X=?