Question

EVALUATE Tan72 Tan18

Answer 1

Answer:

your answer is here buddy.......

Step-by-step explanation:

given

tan 72 × tan 18

it can be written as.......

tan(90-18)× tan 18

rule.....

tan(90-A)=cot A

then...,it is written as.....

cot18 × tan 18

rule....

cot A= cos A / sin A......&

tan A= sin A / cos A...

then.....

cos 18 ×. sin 18

sin 18. cos 18

then .....

cos 18 & cos 18...will get cancel & ......sin 18 & sin 18 will get cancel........

then it would be.....1

SO THE ANSWER IS = 1

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