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Step-by-step explanation:
Sin(x+y) a+b
_________= ________
Sin(x-y) a-b
= sin(x+y)+sin(x-y) (a+b)+(a-b)
______________________=______________
Sin(x+y)-sin(x-y) (a+b)-a+b
= by using identity[2sinAcosB=sin(a+b)+sin(a-b)
= 2 sin x cos y 2a
______________= ______
2 cos x sin y 2b
= as we know[ sin x ÷ cos x =tan x]
SO = tan x × 1 a
____= ___
tan y b
Therfore tan x a
______ = _____
tan y b
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