Prove the following :
Matching exercise
Match the items on the right to the items on the left.
Check
OK
(i) sin θ sin (90° − θ) − cos θ cos (90° − θ) = 0
(v) sin (50° − θ) − cos (40° − θ) + tan 1° tan 10° tan 20° tan 70° tan 80° tan 89° = 1
