Verifying Identities:
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Double Angle Identities:
Recall: sin2x = cos2x = or = or = tan2x = or = And, just so you know...
csc2x = sec2x = cot2x = 6
Use double angle identities to verify:
tanx = 1 ­ cos2x
sin2x 7
Use double angle identities to solve:
2cosx + sin2x= 0
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Solve:
12sinxcosx = 3
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Solve: tan2x ­ 2cosx = 0
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Use the figure to find the exact value of the trigonometric function.
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sinθ
θ
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sin2θ
csc2θ
cos2θ
sec2θ
tan2θ
cot2θ
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Find the exact values of sin2θ, cos2θ, tan2θ using double
angle formulas.
ex. sinθ = 8/17
(This is the same idea as before, just not with a given picture.)
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