trig module 10 identities practice
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Last updated 4:15 AM on 4/2/26
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9 Terms
1
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\sin\left(a+b\right)= | [Sum identity]
\sin a\cos b+\cos a\sin b
2
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\cos\left(a+b\right)= | [Sum identity]
\cos a\cos b-\sin a\sin b
3
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\tan\left(a+b\right)= | [Sum identity]
\frac{\tan a+\tan b}{1-\tan a\tan b}
4
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\sin\left(a-b\right)= | [Difference identity]
\sin a\cos b-\cos a\sin b
5
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\cos\left(a-b\right)= | [Difference identity]
\cos a\cos b+\sin a\sin b
6
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\tan\left(a-b\right)= | [Difference identity]
\frac{\tan a-\tan b}{1+\tan a\tan b}
7
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\sin^2\theta+\cos^2\theta= | [Pythagorean identity]
1
8
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\tan^2\theta+1= | [Pythagorean identity]
\sec^2\theta
9
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1+\cot^2\theta= | [Pythagorean identity]
\csc^2\theta
