Question
Tue February 24, 2009 By: Arunima Nair

Evaluate without using trionometric tables-

Expert Reply
Thu February 26, 2009

use the fact that

cosec(90-x)=sinx

cos 48=sin42 (as 48 and 42 are complementary angles)

sec 52 =cosec 38( as 52 ans 38 are complementary angles)

cosec 70=sec 20( as 20 and 70 are complementary angles)

and then evaluate the expression

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