I

I. H thc c bn.

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II. Cng thc Sin b, ph cho, cos i, Tan sai.

1. i nhau:

2. B nhau:

3. Ph nhau:

4. Sai nhau:

III. Cng thc cng:

IV. Cng thc nhn i:

V. Cng thc nhn ba:

VI. Cng thc h bc:

VI. Cng thc chia i:

VII. Tng thnh tch:

VIII. Tch thnh tng :