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From trignometry of maths we can use the basic formula required for it.
Dear student As tan60 = √3Niw main thing we have ti find out istan 6 tan 42 tan 78 (tan18)/ tan18 = tan 6 tan (90 -18) tan (60+18) tan 18 /tan18 Use formula tan A tan (60-A) tan(60+A) = tan3A = tan 6 tan54 /tan18 = tan 6 tan (60-6) tan(60+6) /tan 18 tan 66 = Tan 18/tan 18 tan 66 = 1/tan 66 Hence answer will be√3 /tan66 Means I think you have typed wring as it should be tan66 instead of tan60
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