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Physics 27 Online
OpenStudy (anonymous):

Can anybody show me mathematical proof of how area becomes cos thita in lambert's cosine law?

OpenStudy (anonymous):

in trigonometry, the law of cosines (also known as the cosine formula or cosine rule) relates the lengths of the sides of a plane triangle to the cosine of one of its angles. Using notation as in Fig. 1, the law of cosines says

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