सिद्ध करो : (cos 70^(@))/(sin 20^(@))+ ( cos 59^(@))/( sin 31^(@))-8 sin^(2) 30^(@)=0 | 10 | त्...

(cos 70^(@))/(sin 20^(@)) + (cos 59^(@))/(sin 31^(@) ) - 8 sin^(2) 30^(@) is equal to

(cos70^(@))/(sin20^(@))+(cos59^(@))/(sin31^(@))=8sin^(2)30^(@)

Prove that ((cos70^(@))/(sin20^(@)))+((cos59^(@))/(sin31^(@)))-8cos^(2)60^(@)=0

(sec70^(@))/(csc20^(@))+(sin59^(@))/(cos31^(@))

(cos80^(@))/(sin10^(@))+cos59^(@)cos ec31^(@)=2

(sin31^(@))/(2cos59^(@))=

(cos 20^(@)+8 sin 70^(@) sin 50^(@) sin 10^(@))/( sin^(2)80^(@)) is equal to

(sin 70^(@) + cos 40^(@))/(cos 70^(@) + sin 40^(@))=

(sin70^(@))/(cos20^(@))+(csc20^(@))/(sec70^(@))-2cos70^(@)csc20^(@)=0

Consider the following : 1. (cos 75^(@))/(sin 15^(@)) + (sin 12^(@))/(cos 78^(@)) - (cos 18^(@))/(sin 72^(@)) =1 2. (cos 35^(@))/(sin 55^(@)) - (sin 11^(@))/(9cos 79^(@)) + cos 28^(@) "cosec" 62^(@) =1 3. (sin 80^(@))/(cos 10^(@)) - sin 59^(@).sec 31^(@) =0 Which of the above are correct ?