Math, asked by sumitchandramola030, 6 months ago

If sin (7 © +9) = cos 2© , find a value of © .

Answers

Answered by anshikaminocha132

1

Answer:

Consider the given equation.

sin(7ϕ+9

∘

)=cos2ϕ

sin(7ϕ+9

∘

)=sin(90

∘

−2ϕ)

7ϕ+9

∘

=90

∘

−2ϕ

9ϕ=81

∘

ϕ=9

∘

Hence, this is the required value of ϕ.

Step-by-step explanation:

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