Question

Question 4: Show that :
(i) tan 48° tan 23° tan 42° tan 67° = 1

​

Answer 1

Answer:

Step-by-step explanation:

tan48 tan23 tan42 tan67

=tan48 tan23 cot48 cot23

=1

Answer 2

Answer:

= tan (90° − 42°) tan (90° − 67°) tan 42° tan 67°

= cot 42° cot 67° tan 42° tan 67°

= (cot 42° tan 42°) (cot 67° tan 67°)

= (1) (1)

= 1

LHS=RHS

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