11 sin 70 degree/7 cos 20 degree - 4 cos 53 degree coses 37 degree/7 tan 15degree tan 35 degree tan 55 degree tan 75 degree
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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 Ans.
=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 Ans.
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we have to just change the values into corresponding complimentary angles
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