Question

(2) Show that cos 30 - sin 30 =(cos 0 + sin )(1-2 sin 20)​

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Answer:

Step-by-step explanation:

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cos(20°+θ)=sin30°

⇒cos(20°+θ)=cos(90°−30°)

⇒20°+θ=60°

⇒θ=40°

Hence, the answer is 40°.