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lukranit [14]
2 years ago
14

2sinx / cos3x = tan3x - tanx -verify the identity-

Mathematics
1 answer:
scoundrel [369]2 years ago
6 0

Answer:

cos3x+tan3x=0  

⟹cos3x=−tan3x

⟹cos3x=−sin3xcos3x

⟹cos23x=−sin3x

⟹1−sin23x=−sin3x

⟹sin23x−sin3x−1=0

This is a quadratic equation in sin3x.

sin3x=−(−1)±(−1)2−4×1×(−1)−−−−−−−−−−−−−−−−−√2×1

sin3x=1±5–√2

If x takes real values, the upper sign must be rejected.

sin3x=1−5–√2

⟹3x=nπ+(−1)nsin−11−5–√2

⟹x=13[nπ+(−1)nsin−11−5–√2]

Step-by-step explanation:

Hope this kind of helps

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OlgaM077 [116]

Answer:

80% of 16 is 12.8

Step-by-step explanation

80% = 0.8

16*0.8=12.8

8 0
4 years ago
Hello you guys can you help me with this thanks! Compare. Choose the correct symbol.
geniusboy [140]

Answer:

B) >

Step-by-step explanation:

You can compare fractions by converting them into a decimal and examining which one has the greater value.

3/4 = 0.75

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From this, we can see that 3/4 is greater than 3/5, so the sign will be >.

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note: You can also find the least common denomiator between the fractions and compare their numerator values to find which one is bigger. The one with the larger numerator will be the greater fraction.

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3 years ago
What is this answer -2+7(-4)
n200080 [17]

Answer:

= -30

Step-by-step explanation:

−2+(7)(−4)

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7 0
3 years ago
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Evaluate the expression<br> I 13 I + I -2 I
sertanlavr [38]

Answer:

15

Step-by-step explanation:

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3 years ago
* Can someone please help me??? *<br> * 8th-grade math *<br> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
serg [7]

Answer:

B,C

Step-by-step explanation:

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3 years ago
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