logtan18+logtan36+logtan54+logtan72
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Answered by
19
Step-by-step explanation:
= logtan18 + logtan36 + logtan54 + logtan72
= log (tan18 * tan36 * tan54 * tan72)
= log (tan18*tan36* tan(90-36) * tan(90-18))
= log(tan18 * tan36 * cot36 * cot18)
= log (1)
= 0
Answered by
2
answer for your question will be 1..
tan(90-@)= cot@
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