without ising the trigonometric tables evaluate
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cos(20) = cos(90-70) = sin(70)
cosec(37) = cosec(90-53) = sec(53) = 1/cos(53)
tan(75) = tan(90-15) = cot(15)
tan(55) = tan(90-35) = cot(35)
so answer is 11/7 - 4/7 = 1
cosec(37) = cosec(90-53) = sec(53) = 1/cos(53)
tan(75) = tan(90-15) = cot(15)
tan(55) = tan(90-35) = cot(35)
so answer is 11/7 - 4/7 = 1
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