If `5 cos 2theta + 2 cos^2 (theta/2) + 1 = 0`,`-pi lt theta lt pi` , then `theta` can be

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Prove that 2 (sin⁶A + cos⁶A) − 3 (sin⁴A + cos⁴A) + 1 = 0 | Trigonometry Important Question

`tan^2 theta = 1+2 tan^2 phi` の場合、`cos 2 phi = 1 + 2 cos 2 theta` であることを証明してください。

`cos(2theta)cos(theta/2)-cos(3theta)cos((9theta)/2)=sin(5theta)sin((5theta)/2)`

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等式を証明せよ: `tan^(2)theta+cot^(2)theta +2=sec^(2)theta cosec^(2)theta`

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