Preaload Image
Back

Home › forums › Maths › Grade 12 › Simplify the following expression to ONE trigonometry term: › Reply To: Simplify the following expression to ONE trigonometry term:

January 12, 2021 at 9:58 am #21939

Notice: Function WP_Object_Cache::add was called incorrectly. Cache key must not be an empty string. Please see Debugging in WordPress for more information. (This message was added in version 6.1.0.) in /var/www/syafunda.net/wp-includes/functions.php on line 5835

Notice: Function WP_Object_Cache::add was called incorrectly. Cache key must not be an empty string. Please see Debugging in WordPress for more information. (This message was added in version 6.1.0.) in /var/www/syafunda.net/wp-includes/functions.php on line 5835

Notice: Function WP_Object_Cache::add was called incorrectly. Cache key must not be an empty string. Please see Debugging in WordPress for more information. (This message was added in version 6.1.0.) in /var/www/syafunda.net/wp-includes/functions.php on line 5835
Anonymous
Member

sin (180+x) cos (90-x)
= -sin x . sin x (180+ is the 3rd quadrant and sin is negative there ; 90- is 1st quadrant and cos is positive, then reduction by 90 changes cos to sin)
= -sin^2 x