If 42x=132,then x is
-5/4
4/5
-3/4
3/5
42x=132⇒(22)2x=125⇒24x=2−5⇒4x=−5⇒x=−54.
If cos A - 3 sinA = -1 and A is an acute angle; then the value of sin A is?
If cos4A – sin4A = 35, then 2cos2A–1=?