tan13A-tan9A-tan4A=Tan13A tan9A tan4A
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tan13A = tan( 9A + 4A )
= ( tan9A + tan4A)/( 1-tan9A.tan4A)
tan13A - tan13A.tan9A.tan4A = tan9A + tan4A
tan13A - tan9A - tan4A = tan13A.tan9A.tan4A
hence proved//
= ( tan9A + tan4A)/( 1-tan9A.tan4A)
tan13A - tan13A.tan9A.tan4A = tan9A + tan4A
tan13A - tan9A - tan4A = tan13A.tan9A.tan4A
hence proved//
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