Menyelesaikan cos^2 (60 deg) + sec^2 (60 deg) - 4 = | Equatix - Math Solver

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Example

3(r+2s)=2t-4

a⋅(b-2)=3b

3(r+2s)=2t-4

a⋅(b-2)=3b

Question

$$\cos^{2}60^{\circ}+\sec^{2}60^{\circ}-4=$$