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Thought-Process to Discover Knowledge

Welcome to nubtrek.

Books and other education websites provide "matter-of-fact" knowledge. Instead, nubtrek provides a thought-process to discover knowledge.

In each of the topic, the outline of the thought-process, for that topic, is provided for learners and educators.

Read in the blogs more about the unique learning experience at nubtrek.
mathsAdvanced TrigonometryTrigonometric Identities for compound angles

### Compound Angles: cos(A+B), sin(A-B), cos(A-B)

In this page, a simple proof, based on the earlier result of sin(A+B), is explained for expressing cos(A+B), sin(A-B), cos(A-B) in terms of sinA, sinB, cosA , and cosB.