Evaluate : sin 18°cos 72°___
sin 18∘cos 72∘ =sin (90∘−72∘)cos 72∘ =cos 72∘cos 72∘=1 (As, sin (90∘ - A) = cos A)
Evaluate :sin18∘cos72∘.
Evaluate
(I)
(II)
(III) cos 48° − sin 42°
(IV)cosec 31° − sec 59°