Math, asked by kumarapureshma, 6 months ago

Show that cos 100 cos 40 + sin 100sin40
(March-2008
1

Answers

Answered by shreyasip123

1

formula: COS(A-B) = cosAcosB+sinAsinB

so, cos(100-40)= cos100 cos40+sin100sin40

cos(60) = 1/2

thus cos100cos40+sin100sin40= 1/2

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