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### Course: Class 11 math (India) > Unit 3

Lesson 6: Trigonometric equations- Proof of the Pythagorean trig identity
- Using the Pythagorean trig identity
- Use the Pythagorean identity
- Solving sinusoidal equations of the form sin(x)=d
- Solving cos(θ)=1 and cos(θ)=-1
- Principal solutions of trigonometric equation
- General solution of trigonometric equation

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# Use the Pythagorean identity

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