without using the trigonometric table, find the value of cos70÷sin20+cos57coses33-2cos60
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=cos70/cos(90-20) ( sinx= cos 90-x)
+ cos57 × 1/ sin 33 ( Cosec x = 1/sinx)
-2cos60
1+ 1- 1.73
= .27
+ cos57 × 1/ sin 33 ( Cosec x = 1/sinx)
-2cos60
1+ 1- 1.73
= .27
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