(1) Cos²30°.cos² 45°+4 sec²60°+½cos²90°. 2tan²30°
(2) Cos²30°.cos² 45°+4 sec²60°+½cos²90°- 2tan²30°
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(1) Cos²30°.cos² 45°+4 sec²60°+½cos²90°. 2tan²30°
(2) Cos²30°.cos² 45°+4 sec²60°+½cos²90°- 2tan²30°
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