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AJIT KUMAR SINGH

· started a discussion

· 1 Months ago

Put value (Question: 111093.0 )

A 90 B 0

Question:
cos (A+B). cos (A-B) is given by :
Options:
A) cos2 A-cos2B
B) cos (A2 - B2)
C) cos2 A - sin2B
D) sin2 A - cos2B
Solution:
Ans: (c)

cos (A+B). cos (A-B) = cos2 A- sin2 B

Knowledge Expert

· commented

· 1 Months ago

Dear Student,
You can also solve by using this method by taking A=90 and B=0

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