Math, asked by sdas86339, 4 months ago

express each of the following in terms of trigonometric ratios of angles between a 0 degree to 45 degree tan 81 degree + Cos 72 degree

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Answered by jprateek413

1

Step-by-step explanation:

since tan of angle ie tan@(@=thita)=cot(90-@)

therefore

tan81=cot(90-81)= cot9

similarly

cos@=sin(90-@)

cos72=sin(90-72)=sin18

therefore tan81+cos72 = cot9+sin18

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