Foundation
Mathematics Foundation
Introduction to Trigonometry
Question

cos38ºcosec52ºtan18ºtan35ºtan60ºtan72ºtan55º=?

13

3

13

23

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Solution

cos38ºcosec52ºtan18ºtan35ºtan60ºtan72ºtan55º=cos38ºcosec(90º38º)(tan18ºtan72º)(tan35ºtan55º)tan60º

=cos38ºsec38ºtan18ºtan(90º18º)tan35ºtan(90º35º)3

[   tan60º=3]

=1(tan18ºcot18º)(tan35ºcot35º)3=13

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