Actually, those questions require us to develop those equations to derive into trigonometrical equations so that we can unveil them or not. Doing it only two alternatives, the other ones will not result in Trigonometrical Identities.

Examining

A) True

$\frac{1-tan^{2}x}{2tanx} =\frac{1}{tan2x} \\ \frac{1-tan^{2}x}{2tanx} =\frac{1}{\frac{2tanx}{1-tan^{2}x}}\\ tan2x=\frac{1-tan^{2}x}{2tanx}$

Double angle $tan2\alpha =\frac{1 -tan^{2}\alpha }{2tan\alpha}$

B) False,

No further development towards a Trig Identity

C) True

Double Angle Sine Formula $sin2\alpha =2sin\alpha *cos\alpha$

$sin(8x)=2sin(4x)cos(4x)\\2sin(4x)cos(4x)=2sin(4x)cos(4x)$

D) False No further development towards a Trig Identity

$[sin(x)-cos(x)]^{2} =1+sin(2x)\\ sin^{2} (x)-2sin(x)cos(x)+cos^{2}x=1+2sinxcosx\\ \\sin^{2} (x)+cos^{2}x=1+4sin(x)cos(x)$

7 0

3 years ago

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50 POINTS HURRY will give brainliest

Reptile [31]

Answer:

Step-by-step explanation:

6x + 5x + 26.5 + 7x - 8 + 4x+21.5+5x+19+10x+13.5 = 720

37x + 72.5 = 720

37x = 647.5

x = 17.5

Vertices = 105 deg, 114 deg, 114.5 deg, 91.5 deg, 106.5 deg, 188.5 deg

7 0

2 years ago

What is seventy-nine divided by twenty-five.

Elodia [21]

3.16 is the correct answer

4 0

2 years ago

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