Proving Trigonometric Identities
21 videos • 1,687 views • by mroldridge
1
Prove sinx/tanx=cosx
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2
Prove sinx/tanx=cosx
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3
Prove sinx*cosx*tanx=1-cos^2x
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4
Prove (1-cos^2x)/sinx=sinx
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5
Prove sin^2x+sinxcosx/tanx=1
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6
Prove 2sin^2x-1=sin^2x-cos^2x
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7
Prove cos^2x-sin^2x=2cos^2x-1
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8
Prove (sinx-cox)^2=1-2sinxcosx
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9
Prove 1/cosx=tanx/sinx
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10
Prove cos^2xtan^2x=sin^2x
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11
Prove sin^2x+cos^2x+tan^2x=1/cos^2x
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12
Prove (sin^2x-6sinx+9)/(sin^2x-9)=(sinx-3)/(sinx+3)
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13
Prove sin^4x+2sin^2xcos^2x-cos^4x=1
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14
Prove sin^4x-cos^4x=sin^2x-cos^2x
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15
Prove (1+tan^2x)(1-cos^2x)=tan^2x
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16
Prove 1/(1-cosx)+1/(1+cosx)=2/sin^2x
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17
Prove tanx+1/tanx=1/(sinxcosx)
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18
Prove 1/sin^2x+1/cos^2x=1/sin^2xcos^2x
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19
Prove (1+tan^2x)/(1-tan^2x)=1/(cos^2x-sin^2x)
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20
Prove sinx/(sinx+cosx)=tanx/(1+tanx)
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21
How to find Theta so cos(Theta) = 1/2 ?
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