Trig Formulas Gr.11 Math
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11 Terms
1
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SOHCAHTOA (ratio version)
tanθ = y/x
sin is x
cos is y
2
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What is cos(-θ)?
cosθ
others are like -sinθ
3
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what’s make trig function makes 1?
sin2θ + cos2θ =
can rearrange to ‘sin2θ=1-cos2θ’
4
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in Q1 what is cos & sin?
sinθ = cos(90-θ)
cosθ = sin(90-θ)
5
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in Q2 what is cos and sin?
-sinθ = cos(90+θ)
cosθ = sin(90+θ)
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What is the formula in Q1 and Q2?
θ
180-θ
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What is formula in Q3 and Q4?
180+θ
360-θ
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Describe and name the two special angles?
good job!
9
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Area rule (3)
A = ½ ab sin C
B = ½ bc sin A
C = ½ ac sin B
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Sine rule
sin A / a = sin B / b = ….
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Cosine rule (3)
a² = b² + c² - 2bc cos A
b² = a² + c² - 2ac cos B
c² = a² + b² - 2ab cos C
Note 
Flashcards (61)