Question

If cos 40 × cos 50 - sin 40 × sin 50

Answer 1

Answer:

above question is of the form cosAcosB-sinAsinB=cos(A+B)

Step-by-step explanation:

A=40

B=50

applying the formula

we get

cos(40+50)

cos(90)

the value of cos90° is 0

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Answer 2

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