What is cos^2(θ/3)-sin^2(θ/3) ?

The solution to cos^2(θ/3)-sin^2(θ/3) is cos((2θ)/3)

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simplify cos^2(θ/3)-sin^2(θ/3)

simplify

cos^{2} (\frac{θ}{3}) - sin^{2} (\frac{θ}{3})

cos (\frac{2 θ}{3})

Solution steps

cos^{2} (\frac{θ}{3}) - sin^{2} (\frac{θ}{3})

Rewrite using trig identities

= cos (\frac{2 θ}{3})

\frac{1}{2} x^{\frac{- 1}{2}}

30 \cdot 9

\frac{( 6 x ^{2} + 2 x - 20 )}{( 3 x - 5 )}

- \frac{3}{2} + \frac{5}{9}

- 2 m + (3 m + 8) - 5 m + 1

What is cos^2(θ/3)-sin^2(θ/3) ?
The solution to cos^2(θ/3)-sin^2(θ/3) is cos((2θ)/3)