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Step-by-step explanation:
sin² + 2sin.cosec + cosec² + cos² + 2cos.sec + sec²
sin² + cos² + 2 + 2 + cosec² + sec²
1 + 2 + 2 + cosec² + sec²
5 + 1 + cot² + 1 + tan²
7 + cot² + tan²
Hence,
tan² +cot² +7 RHS proved...
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