Question

please help
please tell both questions
class 11 maths chapter 3 Trigonometry
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Answer 1

Answer:

3) 1/2

Step-by-step explanation:

=Cos 80° cos 20°+ sin 80° sin 20°

We have already know

cos A cos B + sin A sin B =cos(A-B)

=cos (80-20)

=cos (60)

=1/2.

Answer 2

Answer:

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