Question

cos*2A +sin*2A=======
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Answer 1

Answer:

sin4A

Step-by-step explanation:

sinC+sinD=2sin(c+d/2)cos(c+d/2)

cos2A+sin2A=2sin(2a+2a/2)cos(c+d/2)

=2sin(2a)cos(2a)

since, 2sinAcosA=sin2A

so,cos2A+sin2A=sin2(2a)

=sin4A

pls mark me as brainliest if u understand this

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