3 sin 28° sec 62° + cos2 20 ° + cos2 70 ° − sec2 45° + sin 30°
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3sin28° sec62°+cos^20°+cos^70°-sec^45°+sin30°
=3sin(90°-62°) sec62° +cos^(90°-70°) +cos^70°-sec^45°+1/2
=3cos62°sec62°+sin^70°+cos^70°-sec^45°+1/2
=3+1-sec^45°+1/2
=4+1/2-sec^45°
=2-sec^45°
=2-(√2) ^
=2-2
=0
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