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2 cards from this section. Quick, good the night before a test.
Prove: 1 + tan²θ = sec²θ at θ = 45°.
Remember tan(45°) equals 1.
Calculate sin(60°)² and cos(60°)². What do you get?
Square each sine and cosine value.
What is the value of sin(30°)?
Think back to the unit circle values.
Is sin²θ + cos²θ always equal to 1?
Recall the identity for any angle θ.
Prove 1 + cot²θ = csc²θ by using specific angle values.
Use known angle values to verify the equation.
Sketch the transformation of y = sin(x + 90°) and explain the phase shift.
Focus on phase adjustments in the graph.
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