#fo (1 + tan e) cos .cos (90° - 0) = tan 0.

cos^(-1 ) tan 0^(@)

tan ((1)/(2) cos ^(-1) 0)=

Simplify : ("sec"(270^@ - A) "sec"(90^@ - A) - tan (270^@ -A) tan (90^@ + A))/(cot A + tan (180^@ + A) + tan (90^@ + A) + tan (360^@ - A) + cos 180^@)

If (cos (AB)) / (cos (A + B)) + (cos (C + D)) / (cos (CD)) = 0 Prove that tan A tan B tan C tan D = -1

The value of a sin 0^(@) + b cos 90^(@)+ c tan 45^(@) is

(cos (AB)) / (cos (A + B)) + (cos (C + D)) / (cos (CD)) = 0rArr tan A tan B tan C tan D =

The value of (cos (90^(@) + A) sec ( 360^(@) - A) tan ( 180^(@) - A))/( sec (A - 720^(@)) sin ( 54 0 ^(@) + A) cot (A - 90^(@))) is

The value of (sin 30^(@) - cos 60^(@) + tan 45^(@))/(cos 90^(@) + tan 45^(@) + sin 90^(@)) is

If ABCD is a cydic quadrilateral such that 12 tan A - 5 = 0 and 5 cos B + 3 = 0, then cos C tan D =

Show that 1/cos O/-cos O/ = tan O/ cdot sinO/ (0^o < O/ <90^o)