5 cos2 600 + 4 sec2 30° - tan2 450
Evaluate :
sin2 30° + cos2 300
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cos²60⁰ + 4 sec²30° - tan²45⁰ = 1/4 + 4/3 - 1 = 7/12
sin²30° + cos²30⁰ = 1
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