Trigonometry

Trigonometry equalities, inequalities and expressions - sin, cos, tan, cot

Trigonometry

Postby Guest » Fri May 10, 2013 5:25 pm

Show that the equation 3sin^(2)θ-2cos^(2)θ=1
can be written as 5sin^(2)θ=3
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Re: Trigonometry

Postby Math Tutor » Sun May 12, 2013 1:54 am

sin2t + cos2t = 1
so
cos2t = 1 - sin2t

Can you write the rest?

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Re: Trigonometry

Postby Guest » Mon Dec 02, 2013 10:28 am

sinx+cosx=1
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Re: Trigonometry

Postby leesajohnson » Thu Nov 24, 2016 6:13 am

sin²t + cos²t = 1

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Re: Trigonometry

Postby Guest » Thu Nov 24, 2016 2:47 pm

You need to do the sum........not just write out the trig. identity.....

Show that the equation 3sin^2t-2cos^2t=1
can be written as 5sin^2t=3

Cos^2t+Sin^2t=1 ....>>...Cos^2t=1-Sin^2t

So ... 2cos^2t = 2(1-Sin^2t)

and ... 3sin^2t-2cos^2t = 1 ...same as... 3sin^2t-2+2Sin^2t = 1 ...same as... 5Sin^2t = 3

...................................
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