document.write( "Question 814281: State the formula for sin(a+b) and use it to show sin(a+Pi/2)=cos a \n" ); document.write( "

Algebra.Com's Answer #490199 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
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document.write( "Hi,
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document.write( "sin(a + b) = sin a cos b  +  cos a sin b
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document.write( "= cos a
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document.write( "Note:  and   \n" );
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