Math, asked by nagaraj4224, 10 months ago

cos40°+cos50°=√2 cos5°

Answers

Answered by sandy1816

5

Step-by-step explanation:

cos50+cos40

=2cos(50+40/2)cos(50+40/2)

=2cos45cos5

=2.1/√2.cos5

=√2cos5

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