theta equals to 30 degree verify that cos square theta equals to cos squared theta equals to 1 minus 10 square theta upon 1 + 10 squared theta
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θ=30°
⇒(1-tan²θ)/(1+tan²θ)=(1-tan²30°)/(1+tan²30°)
⇒[1-(1/√3)²]/[1+(1/√3)²]=(1-1/3)/(1+1/3)=(2/3)/(4/3)=1/2=cos²θ
∴(1-tan²θ)/(1+tan²θ)=cos²θ
⇒(1-tan²θ)/(1+tan²θ)=(1-tan²30°)/(1+tan²30°)
⇒[1-(1/√3)²]/[1+(1/√3)²]=(1-1/3)/(1+1/3)=(2/3)/(4/3)=1/2=cos²θ
∴(1-tan²θ)/(1+tan²θ)=cos²θ
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