log tan 1 +log tan 2 +log tan 3 ........log tan 89
Answers
Answer:
Step-by-step explanation:
Hi,
logtan1+logtan2+logtan3+……………….+logtan89
=log(tan1×tan2×tan3×……………×tan89)
since loga+logb=log(a×b)
we know that tan89=tan(90-1)=cot1
Tan89=cot1
tan88=cot2
tan87=cot3
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We know that tan@×cot@=1
Therefore,
tan1×tan89=1
tan2×tan88=2
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Therefore the given question will be
log(1×1×1×1×1............×1)=log1=0
OR
we know that log a + log b = log ab.
=>log ( tan 1× tan 2× tan 3 × ............tan 89)
=>log ( tan 1 × tan 2×....tan 44 ×cot 44× cot 43....cot 2 × cot 1). {tan a = cot 90-a}
=> log( 1×1×1×1...×1)
=>log (1)
=> 0.
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Answer:
log tan 1 + log tan 2 + .....
log tan 89
= log tan (90-1)
= log cot 1
= -log tan 1
similarly every value will get cancelled with its pair
except the middle one which has no pair
therefore ans would be
log tan 45 = log 1 =0
therefore answer is zero
Step-by-step explanation:
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