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[" TRIGONOMETRIC RATIOS AND IDENTITIES "],[" 20.If "A=tan6^(@)" tan "42^(@)" and "B=cot66^(@)cot78^(@)" ,then "],[[" (a) "A=2B," (b) "A=1/3," (c) "A=B," (d) "3A=2B]]

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If A=tan6^(@) tan 42^(@) and B= cot 66^(@)cot 78^(@) then-

If A=tan6^(@) tan 42^(@) and B= cot 66^(@)cot 78^(@) then-

If A=tan6^(@) tan 42^(@) and B= cot 66^(@)cot 78^(@) then-

If A=tan6^(@)tan42^(@) and B=cot66^(@)cot78^(@), then

If A=tan6^(@)tan42^(@) and B=cot66^(@)cot78^(@) then

If A=tan6^(@) tan42^(@), B=cot66^(@) cot78^(@) then

If A = tan 6^@ tan 42^@ and B = cot 66^@ cot 78^@, then

tan 6 ^(@) tan 42 ^(@) tan 66 ^(@) tan 78^(@) =1

If A =tan6^0tan42^0 and B=cot66^0cot78^0 , then