Question

Evaluate: cos 3A + 2 cos 4A
____________________. when A = 15
sin 3A + 2 sin LA
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Answer 1

Answer:

Step-by-step explanation:

when A = 15 sin 3A

cos 3A + 2 cos 4A=cos 45+cos 60=1/root 2+1/2=root 2+1/2

Answer 2

if A=15

then,

cos3A+2cos 4A

=>cos45+2cos60

=>(1/√2)+2×1/2

=>(1/√2) +1

=>(√2+1) /√2

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