Question

Taking 0 = 30°, verify each of the following:
(i) sin 2 theta = 2 sin theta cos theta
(ii) cos 2 theta = 2 cos square theta-1 = 1-2 sin square theta
(iii) tan 2 theta = 2tan theta/1-tan square theta

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step by step​

Answer 1

Answer:

let the 2theta be A+B

then

sin(A+B)=SinA CosB+CasAsinB

since A&B are same

so

Sin A+A =SinACosA+CosASinA

then

Sin 2thet=Sin2A=2SinACosA

Answer 2

Step-by-step explanation:

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