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सिद्ध कीजिए कि (cos35^(@))/(sin55^(@))+(...

सिद्ध कीजिए कि `(cos35^(@))/(sin55^(@))+(sin11^(@))/(cos79^(@))-cos28^(@)cosec62^(@)=1.`

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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 ?

Without using Trigonometric Tables evaluate the following :- (cos35^@)/(sin55)+(sin11^@)/(cos79^@)-cos28^@ cosec62^@ .

(cos 28^(@))/(sin 62^(@))=?

(cos 28^(@))/(sin 62^@)=?

(cos 62^@)/(sin 28^@) =?

Simplify (sin35^(@))/(cos55^(@))+(cos55^(@))/(sin35^(@))-2cos^(2)60^(@)

Evaluate (sin35^(@))/(cos55^(@))+(sec20^(@))/("cosec"70^(@)) .

Evaluate (sin35^(@))/(cos55^(@))+(sec20^(@))/("cosec"70^(@)) .

Prove that ((sin^(2)73^(@)+sin^(2)17^(@)))/((cos^(2)28^(@)+cos^(2)62^(@)))=1.