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forsale [732]
3 years ago
9

Tan9 - tan27 - tan63 + tan 81 = ?

Mathematics
1 answer:
ludmilkaskok [199]3 years ago
8 0
Tan9−tan27−tan63−tan81
tan9+tan81−tan27−tan63
sin9/cos9+sin81/cos81−sin27/cos27−sin63/cos63
sin90/cos81cos9−sin90/cos63cos27
1/sin9cos9−1/sin27cos27
2/sin18−2/sin54
(2)sin54−sin18/sin18sin54
4cos36sin18/sin18cos36=4
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How many times can you subtract 10 from 100? I will mark the correct answer brainliest!
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4 years ago
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The proof, with a missing reason, proves that the measure of angle ECB is 54°.
aniked [119]

Answer:

Midsegment of a Triangle Theorem

Step-by-step explanation:

In\: \triangle ADE\\m\angle A + m\angle D + m\angle AED = 180°\\\therefore 90°+36°+m\angle AED= 180°\\\therefore 126° +m\angle AED = 180°\\\therefore m\angle AED = 180°-126°\\\therefore m\angle AED = 54°\\

In\: \triangle ADE, D and E are mid points of sides AB and AC respectively.

Therefore, DE || BC

Hence, by Midsegment of a Triangle Theorem

m\angle ACB = m\angle AED =54°(corresponding\:\angle 's) \\\therefore m\angle ECB = m\angle AED =54°(\because A - E - C)

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Part A: m< -6

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