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cos 45° = 1/2√2
cos 90° = 0
sin 45° = 1/2√2
sin 90° cos 45° - cos 90° sin 45°
1×1/2√2 - 0×1/2√2
1/2√2-0
1/2√2
2. cot 30° = √3
cosec 30° = 2
cot 30°- cosec 30°
√3-2