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Alberto
Mathematics
20 December, 17:24
Sinxcos y = 1 (sin (x + y) + sin (x-y))
sin x COSY -
+1
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1
)
Blaise
20 December, 17:30
0
Step-by-step explanation:
sin (x+y) = sin x cos y+cos x sin y
sin (x-y) = sin x cos y-cos x sin y
add
sin (x+y) + sin (x-y) = 2 sin x cos y
sin x cos y=1/2 [sin (x+y) + sin (x-y) ]
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