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निम्नलिखित का मान ज्ञात कीजिए । sin (5...

निम्नलिखित का मान ज्ञात कीजिए ।
`sin (50^(@) + theta) - cos (40^(@) - theta) + tan 1^(@) * tan 10^(@) * tan 20^(@) * tan 70^(@) * tan 80^(@) tan 89^(@)`

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tan 70^(@) - tan 20^(@) -2 tan 40^(@)=

tan 70^(@) - tan 20^(@) -2 tan 40^(@)=

tan 70^(@) -tan 20^(@) - 2 tan 40^(@) = 4 tan 10 ^(@).

tan10^(@) tan 20^(@) tan 30^(@) tan 40^(@) tan 50^(@) tan 60^(@) tan 70^(@) tan 80^(@)=

tan 40^(@) +2* tan 10^(@) = A) tan30^(@) B) tan50^(@) C) tan70^(@) D) tan90^(@)

Prove that: tan10^(@) tan20^(@)tan70^(@)tan80^(@)=1

Prove that: tan10^(@) tan20^(@)tan70^(@)tan80^(@)=1

The value of tan 10^(@)* tan20^(@)*tan45^(@)*tan70^(@)*tan80^(@) =_________