Question

If Cos40 =0.7660 find the value of Sin50+Cos40.

Answer 1

sin 50° = sin( 90 - 40 ) = cos 50 °

Cosec 40 = Cosec ( 90 - 50 ) = sec 40°

cos 50 = cos ( 90 - 40 ) = sin 40°

sin 40 Cosec 40 = 1

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sin 50 / cos40 + Cosec 40 / sec50 - 4cos50cosec40

= cos 40 / cos 40 + sec 50/ sec 50 - 4sin 40 Cosec 40

= 1 + 1 - 4

= -2

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