Question

Write the value of sin (45 + theta) cos (45 theta)

Answer 1

Answer:

Let theta equal to t.

sin(45+t). cos(45+t)

= (2.sin(45+t). cos(45+t))/2

= (sin(45+t+45+t) + sin(45+t-45-t))/2

= (sin(90+2t) + sin 0)/2

= sin(2t)/2

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