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Mathematics 9 Online
OpenStudy (anonymous):

Which expression is equivalent to cos(1.4x) − cos(0.6x)?

OpenStudy (welshfella):

use the identity cosA - cosB = -2sin(A+B) sin(A-B) --- --- 2 2

OpenStudy (welshfella):

put A = 1.4x and B = 0.6x

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