If sin 7 -9o-cos 2- find a value of -

Consider the given equation. #10; #10; #160; sin( 7ϕ #10;+9^∘ #160; )=cos 2ϕ #160; #10; #10; #160; sin( 7ϕ #10;+9^∘ #160; )=sin( ...

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If sin 7 ϕ+...

Question

If $sin (7 ϕ + 9^{o}) = cos 2 ϕ$ , find a value of $ϕ$ .

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sin (7 ϕ - 9^{o}) = cos 2 ϕ

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