BASIC INFORMATION
In unit 5.5, we learn the double-angle formulas, the power-reducing formulas, and the half-angle formulas. We will be given all the formulas except for the double-anglge formulas on the test. We also need to know how to derive all the formulas for the test.
DOUBLE-ANGLE FORMULAS:
HOW TO DERIVE THE DOUBLE-ANGLE FORMULAS:
POWER-REDUCING FORMULAS:
HOW TO DERIVE THE POWER-REDUCING FORMULAS:
HALF-ANGLE FORMULAS:
HOW TO DERIVE THE HALF-ANGLE FORMULAS:
If any of these don't make sense to you, watch this video on how to derive the formulas:
Visit the sites below for additional help:
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