tan 8 titha - tan 5 titha - tan 3 titha
= tan 8 titha × tan 5 titha × tan 3 titha
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tan 8x=tan(5x+3x)=tan5x+tan3x/1-tan5x.tan3x
tan 8x-tan8xtan5xtan3x = tan5x+tan3x
tan8x-tan5x-tan3x=tan8x.tan5x.tan3x
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