Question

cot 55 / tan 35 + tan 20/ cot110

Answer 1

The right answer is 1.

We know that cot 110=cot(20+90).

• Therefore cot 55/tan 35 + tan 20 /cot 110
• cot 55/ cot (90-35) + tan 20 / cot (90+20)
• cot 55/ cot 55 + tan 20/ cot 90.cot 20
• 1 + tan 20/ cot 90.cot 20
• 1 + tan² 20/cot 90 .....(1/cot 20= tan 20)
• 1 + tan²20/0 ......( cot 90=0)
• 1+0
• 1

I hope you have understand.

Please mark as brilliant.