# CBSE Class 10 Answered

**PLEASE SOLVE THIS QUESTION**

Asked by | 05 Jun, 2008, 02:27: PM

Expert Answer

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

Answered by | 05 Jun, 2008, 05:43: PM

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