4. Which of the following expressions gives the measure of B? A. cos-1 (152+252-112 2(15)(25) B. cos-1 (152+11²-25² 25 11 C. cos-1 2(15)(11) (252+112-152) 2(25)(11) D. cos-1 (112+252-15² 2(15)(25) B 15

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