Grade 11Trigonometry
Prove that tan 6°* tan 42°*tan 66°*tan78°=1.this question is of class 11 .
1 Answer
Kaustubh
Apply trigo formulaTan(60-x).tanx.tan(60+x)=tan3x Tan54.tan6.tan66=tan18......1Tan42tan18tan78=tan54 ...2Multiply 1 and 2Tan54.tan18.tan6.tan42.tan66.tan78=tan18.tan54Tan6.tan42.tan66.tan78=1
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