What is the value of [sin(x + y) - 2sinx + sin(x - y)]/[cos(x - y) + c – McqOptions

MCQOPTIONS

1.	What is the value of [sin(x + y) - 2sinx + sin(x - y)]/[cos(x - y) + cos(x + y) - 2cosx] × [(sin 10x - sin 8x)/(cos 10x + cos 8x)]?
A.	0
B.	tan2x
C.	1
D.	2tanx
Answer» C. 1

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