Question

show that
tan48 tan23 tan 42 tan67 =1

Answer 1

Hi Friend !!!

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tan 48 = cot 42

= 1/tan42

tan 23 = cot 67

= 1/tan 67

tan 48 tan 23 tan 42 tan 67 = 1

1/tan42 1/tan 67 tan 42 tan 67

= 1

Hope it helps u :-)

Answer 2

Tan 48 . Tan 23 . Tan 42. Tan 67 = l.h.s
Cot (90-48). Cot (90-23) . Tan 42 . Tan 67
Cot 42 . Cot 67. Tan 42 . Tan 67 = 1

We know that tan a. cot a = 1

R.h.s = 1

Hence proved......

Thank u★★★
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