1.

(800 Rl LT

Answer»

11sin70°/7cos20°-4cos53°cosec37°/7tan15°tan35°tan55°tan75°

=11sin70°/7cos(90°-70°)-4cos53°cosec(90°-53°)/7tan15°tan35°tan(90°-35°)tan(90°-15°)

=11sin70°/7sin70°-4cos53°sec53°/7tan15°tan35°cot35°cot15°

=11/7-4/7

=1

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