Question

Prove that : tan 10° tan 20° tan 70° tan 80° = 1
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Answer 1

Answer:

,

Step-by-step explanation:

above pic is your solution

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Answer 2

Step-by-step explanation:

please check the attachment...

since 10°+80°=70°+20°=90°....they are complementary angles...

also..cotø=1/tanø...

hope it helps..