Question: Indicate whether is true or false

1. \(\sin \theta =\cos \left( 90-\theta \right)\)
2. \(\tan \theta =-\cot \left( 90-\theta \right)\)
3. \(\sin \theta =\frac{1}{\csc \theta }\)
4. \(\cos \theta =\frac{1}{\sec \theta }\)
5. \(\sin {{25}^{\text{o}}}=\sin {{155}^{\text{o}}}\)
6. \(\tan {{20}^{\text{o}}}=\cot {{70}^{\text{o}}}\)
7. \(\sin \theta \) is never greater than 1 or less than -1

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