Question
Thu June 05, 2008 By:

PLEASE SOLVE THIS QUESTION

Expert Reply
Thu June 05, 2008

Sin 90 = 1, Sin 45 = 1/2, cos 45 = 1/2

SIN (A+B)= SINA COS B + COS A SIN B

SIN (45+45)= SIN 45 COS 45 + COS 45 SIN 45

SIN 90 = SIN 45 COS 45 + COS 45 SIN 45

1 = 1/2 x 1/2 + 1/2 x 1/2

1 = 1/2 + 1/2

1 = 1

proved

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