Trigonometric Identities and proofs

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Trigonometric Identities and proofs

• Additional maths
• Adrian Sparrow
• www.ibmaths.com

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Using the unit circle
r
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Draw the graph of
On the same axis
Add the graphs together to make the blue line
shown below.
The graph of
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Two more identities starting with
Divide by
Divide by
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Prove the following
use the identity
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Try these with no hints