taa13A-tan9A-tan4A=tan13A.tan9A.tan4A
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Step-by-step explanation:
=> tan13A = tan( 9A + 4A )
=> ( tan9A + tan4A)/( 1-tan9A.tan4A)
=>tan13A - tan13A.tan9A.tan4A = tan9A + tan4A
=>tan13A - tan9A - tan4A = tan13A.tan9A.tan4A
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