(tan68^(@))/(cot2^(@))(1)/(419)sin(9)/(1991m)

Prove that (1+(1)/(tan^(2)A))(1+(1)/(cot^(2)A))=(1)/((sin^(2)A- sin^(4)A)).

prove that: (1+(1)/(tan^(2)A))(1+(1)/(cot^(2)A))=(1)/(sin^(2)A-sin^(4)A)

(2sin68^(@))/(cos22^(@))-(2cot15^(@))/(5tan75^(@))-(3tan45^(@).tan20^(@).tan40^(@).tan50^(@).tan70^(@))/(5) is equal to

Without using trigonometric tables, evaluate : (i) (cos 53^@)/(sin 37^@) (ii) (tan68^@)/(cot 22^@) (iii) (sec49^@)/(cosec 41^@) (iv) (sin 30^@17')/(cos 59^@43')

tan(9 0^(@)-cot^(- 1)1/3)=

cot theta=(2tan7(1)/(2^(@)))/(1-tan^(2)7(1)/(2^(@))) then sin3 theta=

Find the value of (tan 9^(@)+cot9^(@))/(tan27^(@)+cot27^(@)) .

Find the value of (tan 9^(@)+cot9^(@))/(tan27^(@)+cot27^(@)) .

Find the value of (tan 9^(@)+cot9^(@))/(tan27^(@)+cot27^(@)) .

Prove that cosec^(2)22^(@)cot^(2)68^(@)=sin^(2)22^(@)+sin^(2)68^(@)+cot^(2)68^(@) .