1.

tan-1 (1/4) + tan-1( 2/9) is equal to ________.(a) 1/2 cos-1(3/5)(b) 1/2 sin-1(3/5)(c) 1/2 tan-1(3/5)(d) tan-1 (1/2)

Answer»

(d) tan-1 (1/2)



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