Question

HELP PLEASE!
Verify the identity:
sin(x+pi/2)=cos (x)

Answer 1

\[\sin \left(x + \frac{ \pi }{ 2 } \right) = \left( \sin x \right)\left( \cos \frac{ \pi }{ 2 } \right) + \left( \cos x \right)\left( \sin \frac{ \pi }{ 2 } \right)\]\[= \left( \sin x \right)(0) + (\cos x)(1)\]

Answer 2

lhs= sin(x+pi/2)
=SINX COS PI/2+COS X SIN PI/2
=SIN X *0 + COS X*1
=COS X
=RHS
Hence proved

Answer 3

could you help with another one too?

Answer 4

sure

Answer 5

ok tcarroll

Answer 6

Post your question

Answer 7

thanks! See you in the new post!