Math, asked by adi9015, 11 months ago

2sin(45-theta) cos(45-theta)=cos2theta​

Answers

Answered by ds2113141
1

Answer:

Step-by-step explanation:

sin2a =2sina cosa      (by the formula)                                                                                          therefore⇒2sin(45-theta) cos(45-theta)   =sin2 (45 -theta )     ⇒sin (90 -2theta)   ⇒cos2theta  Proved.      [ sin(90 -theta)=cos theta ]

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